Biggest regret of an 'Arcade' title purchase.

Never bought anything from ether of those. I refuse to buy points to buy games on 360, and I haven't had my PS3 long enough in a working condition to buy on there.

First thought was that Dead Rising 2-mini game. But then I came to think of ilomilo. It's not a bad game, its just not rocking my boat. 

I have none. I've only bought Pac-man DX, Limbo, and Risk Factions and, while I don't really play them any more, I enjoyed the hell out of them when I did.

KoF '98 UM - while the game is undoubtedly great it was stupid of me to think I could invest enough time in it to get any satisfaction out of it.

@Mahonay said:

Daggerdale. Bought it under drunk peer pressure.

Yo fuck peer pressure and fuck your peers for liking Daggerdale.

Limbo, easily. That game was gaaaarrrbage.

Castlevania Harmony of Despair

Shank. Perfect example of me getting overexcited, not reading reviews, and buying something on launch day. It did teach me to be more careful with my download choices.

Street Fighter HD remix.  I think it was bc I couldn't wait for SSFIV to come out or something.

Blacklight Tango Down for sure. Pretty bad.

Uno Rush (the first game was fantastic fun--Rush was pure crap that held none of the appeal of Uno)

Alien Hominid (I knew going in that the game was hard, but apparently I'm getting old and my reflexes now suck)

Shank (really enjoyed the demo but the full game has some major difficulty balance problems)

Jetpac Refueled (bought it because the demo seemed fun and a bunch of IGN-tards said it was a great update to a classic game...it's not)

Gameroom... that is all

Tmnt

Band of Bugs. I saw that it was a SRPG and got all excited. Didn't even bother with a trial which was a huge mistake.

N+ and Bionic Commando Rearmed.  Bionic Commando looked great, but played too much like the original for me (meaning way too frustrating).  Ironically I liked the Turtles in Time remake. I think it's better than the original.  Call me crazy :)

Splosion Man, Worms Armageddon and Beyong Good and Evil HD, but Splosion Man is the one I most regret. First couple of levels were fun, but it got incredibly boring very quickly.

I bought Beyond Good and Evil HD and Outland, really should get round to playing them...

I found Limbo and Castlevania: Harmony of Despair to be cruelly lacking in content for their price tag. Seriously, these games are worth 5 bucks, not 15! Aside from that, I had bought Street Fighter 2 Hyper Fighting because I'm a huge fighting game enthusiast and wanted to give another try at SF. But nope, I still find this game excessively simplist and every match play the same. 
 
But I bought Fable 2 Pub Games... so yeah... I probably buy too many games. Then again... I don't buy enough games.

Comic Jumper would be my pick .

I convinced myself Quake Arena Arcade would be a good idea.

I have no clue why I bought the maw. It is a piece of shit.

@nail1080 said:

MNC!

This. I didn't think that game was fun at all. Like, at all.

Alien Hominid. The game is way too hard, I can't finish the second level.

XBLA Wing Commander for the win!  So desperate for a space flight game, i bought it on name only.  I NEVER do that.  I still cry a little.

Full House Poker...it's fun i just never play it

I've downloaded LOTS of bad to horrible games on PSN, but with PSN Plus, I got all them for free. The only ones I paid for are the ones I love and still play once in a while (Pixel Junk Shooter, Final Fight collection, etc.)

Turtles in Time Reshelled. It's awful.

Castle Crashers, leveling up means to much in that game and I just didn't find it fun to play when I was a level 5 and everyone was much higher....  Seemed like no one wanted to play with me because of my rank!!!

Comic Jumper.

And maybe Limbo...but I feel bad about putting down that one, since it's not that bad, but the price for that game was way too much for what I got out of it.

Fable Pub Games and Sonic 2. Sonic 2 was fun 20 years ago, but today? Not so much.

PAIN, noby noby boy and Trash Panic. I've been pretty good about not buying shitty games on XBLA but I seem to gravitate towards them on PSN... don't read anything into that, that's just bad luck. I love my PS3. :)

Turtles in Time, Trials HD, Serious Sam, pretty much any classic shooter, like Doom and Duke Nukem 3D. You really can't get enjoyment out of those games today, because they make shooters so much better now.

Small Arms for XBLA, I think I dislike everything about that game :(

Limbo. I bought it during the Christmas/New Year's sale last year for 800 points and I still felt ripped off. Hell, I still feel ripped off to this day.

Definitely Castle Crashers. Just can't get into it. I might later.

I still haven't booted up A World of Keflings, so I guess that?

My list: 

•  Diner Dash: I thought it was fun and bought, then never played it again.
• Fat Princess: I bought it day one and the servers were pretty busted. Even when the game works, most people are idiots and have no clue how to play the game in my experience. 
• SSF2HDTR: I might be missing some letters, but whatever. I bought it thinking I would like it. I don't. I suck at Street Fighter.
• Detuned: I bought it because it was only $3 and it looked like a Tool music video. It's really boring and stupid. 
• Lumines: It's better on PSP

I bought Beyond Good and Evil HD and Outland, really should get round to playing them...

I've only paid ms points for Dead Rising Case Zero and Monkey Island 2. I regret nothing. I have redeemed a lot of codes for stinkers though, like Ghostbusters Sanctum of Slime, Star Raiders, and Wits & Wagers. If I could undo that and give the codes to someone who might appreciate them I would.
 

@uvschism

Carcassonne probably tops the list for me, but I've made plenty of bad purchasing decisions in XBLA.

I had some friends playing Dungeons and Dragons.
 They say it's fun, want to join us? Ok. I buy, wait to download, fall asleep, wake up and no one plays Dungeons and Dragons, Ever.

Probably Dishwasher samurai. I loved the XNA version and bought it as soon as it was released on XBLA.. and I think I've played it once. I don't necessarily think it's a bad game, just never had any interest in going back.

I bought Eat Them for some reason,l played for an hour and that was it.

Trials HD and 'Splosion man.  Bought both at full price and got stuck fairly early on in both of them.

On  Playstion - Flower, it just wasn't my kinda game and i was disapointed with it all round. 
On 360 - D&D Daggerdale just wasn't a great game, had higher expectations sadly.