Started one of these in the SSFIV forums awhile back thought id do one here ,Original right? 
 
But anyways mine have got to be either Ermac or scorpion that jus spams the unblockable fire move :(

if i'm playing a computer it is Kano.  I never got so buttmad in my life.

Smoke is mines... followed closely by Noob and Scorpion.

oh man totally forgot about noob and his lame ass projectile,someone was totally doing that today in a ranked game : / 

Noob is ridiculous. If you meet a guy who just keeps throwing shadows and teleports, you're basically fucked if you're playing with a character with no teleport.

Yeah, Noob players are typically Noob. 
 
see what i did there? lol

Noob, definitely.

I hate fighting a good Raiden.  
 
A good Raiden can completely destroy me and prevent me from getting in anywhere, either with that near-instant teleport or the superman. 

Playing as Raiden I haven't had much of a problem with anyone, so Smoke?

Ermac.  Most of it is ground-pound envy though.

Online lag.

I don't really have a specific hated opponent, but when I see someone with a good record pick one of the characters considered to be crappy (Shang Tsung, Quan Chi, Baraka, Stryker, Sindel) you know you're in for a rough time.

Online lag.

@JJOR64 said:

Online lag.

Yep. Are they gonna release a patch? 

Gorrro. he is evil but also Ermac all he does is grab and teleport. that is how i play

None of the opponents I've had online have made me as angry as that final Shao Kahn fight. I mean fuck!

Smoke, Noob Saibot, and Scorpion. Not because I constantly loose against them or anything, but because I've fought them so much that I know how to shut then to the point  that fighting them is boring. Scorpion morose than the rest. 

I dislike fighting against Scorpion because I see him so often.  But I simply cannot stand most of the people who play Noob, due to that stupid projectile.

Ermac, Scorpion, and Noob mainly. 

Scorpion due to being so common.

Fought a bastard of a Kano player that was almost impossible to keep up with, but that was pure skill on his part so hard to fault. Ditto for a Sindel user actually.

I primarily play Smoke and Kitana (only started playing online a couple of nights ago), and I totally get why people hate Smoke. I try to minimise the teleport spam, I just like fast characters in games.

Playing and trying to beat(finally succeded) last challenge for several hours, I hate that four bastards. Meelena was a bitch. I do agree with Noob. He is everywhere with that shadow. Though I could beat last challenge only with Sector. Was very close with Smoke. But lost concentration in the second part of fight with Shao Kahn

Online lag.

I've finally been playing online and I can say....Smoke. 

kitana, spam jumping fan move :@

Ermac

Kabal.  Three full screen attacks? Laser, Blade and that unstoppable frigging tornado move.  If he hits you with that and just touches even your toes, you're cooked. So lame.

Kabal.  Three full screen attacks? Laser, Blade and that unstoppable frigging tornado move.  If he hits you with that and just touches even your toes, you're cooked. So lame.

Shao Kahn.....easily.

Jade has some crazy shit, so does smoke...but umm...those are really it. I love playing against scorpion personally, considering that hes pretty much my main now. I wish subzero was better, i still havent played against a good subzero.

I dunno for whatever reason Reptile players work me over hard.  Constantly having to watch out for his  Slide/Rush  +  his projectiles drives me nuts.   Not unbeatable by anymeans but  damn a  good reptile player will keep you on your toes.

Ermac, then Skorpion.

Noob, Scorpion, Sub Zero.

Recently, it'd be a good Sub-Zero player. He can zone you out of most of your options.

Sektor is a dick in the single-player.

Online, I haven't met a character who was overly difficult to figure out.

Raiden and Nightwolf for me. I usually play as Jade, Smoke or Noob.

I hate Quan Chi with ll of my being (as well as every other character from MK4 and later)

But for this game specifically, I really don't like Sektor.

Noob Saibot, but really, uh, anyone. I stink at combos and being anywhere near haflways decent at this game.

I know I'm probably an enormous noob for saying this but I still have a lot of trouble with a decent scorpion player. It's that unblockable fire move; I feel like I have to keep moving if i'm playing a fire happy scorp and then I invariably get hit by the spear when I'm moving out the way of the fire. It's super lame.

Then again playing a scorp player who doesn't really know what they're doing is great fun.

Sektor is a dick in the single-player.

Raiden and Ermac.  I feel that I have a good chance to beat anyone else.  But I have so much trouble against those two.  In fact, I don;t think I have ever beaten a raiden player online. 

Scorpion, Smoke and Ermac. FUCK YOU ERMAC AND YOUR JEDI SHIT.

Ermac, real good Reptiles (Holy SHIT that charging) and SUB ZERO SCREW YOU AND THOSE SHITTY ICE CLONES