May be a bit too early to put this up but anyways I managed to go through most of DJ Hero 2's songs. Pretty solid but there really isn't many memorable songs like in the first game. I fucking loved most of the Daft Punk mixes especially the couple songs mixed with Queen. The new songs are pretty good but most of the list is just songs grabbed out of the top 40 charts so that it will have more mainstream appeal. Deadmau5 songs are my favorite though but my only disappointment is the the lack of Daft Punk.  
 
Which do you guys prefer, if any of you out there actually played the two games?

Having played both games pretty extensively, Rhythm games are always a mixed bag.  Overall I thought DJ Hero 2 had a lot less repetition of songs and there were a few gems in the track list for me.  I understand what you mean by Top 40 with the Lady Gaga and Kanye West tracks but there was also some cool stuff I hadn't heard and wouldn't have bothered if not forced down my neck.
 
I probably have to give it to DJ Hero 2, even though the lack of Daft Punk is a crying shame.

I really like about 5 songs in DJ Hero 2, there are a lot that I don't mind playing and a few that really annoy me. I am also disappointed about the lack of Daft Punk in the tracklist but, I really enjoy the DeadMau5 songs. I did not play DJ Hero 1 however so can't really compare but, the original mixes in general are pretty good in DJ Hero 2. 

I really love a handful of songs from each game but overall I think DJ Hero had a better mix (I miss the DJ/Guitar songs and the older slower stuff like Ain't No Love vs. Bobby Blue Band or w/e and all the Queen and Daft Punk mixes). That being said you can make some of the new songs sound really cool if you do the freestyle sections right but it's all a little more poppy, I think there's really only one song in each game I can't stand - Radio Zulu in DJH and American Boy in DJH2 - so annoying.
 
Hoping they give a DJH1 track pack via DLC or something - or at least some different style of mixes.

I love DJ Hero; I wish they'd have good music.

I much prefer the setlist in DJ Hero 2 to the first one. In the first game there was about one song I wanted to play per set, and it was for that reason that I didn't even finish the career mode (I just stuck to quickplay). My only complaint, and this goes for both games really, is the way they mix some of the songs. Sometimes I'll love one song and find it hardly in the mix at all, only to be dominated by some shitty song I don't care about. Also, the fact that the Jackson 5 are in both games sucks as well, but that's just me.

You guys know a Mix of "Human After All" is unlockable right?
 
I mean, don't get me wrong, I'm a little disappointed that there's not more Daft Punk however I still enjoy a fair number of the tracks on the setlist.

DJ Hero, Original Mix.  By a country mile.
 
Not even close.