1. Street Fighter II': Hyper Fighting
The one reason that people couldn't wait for this game to release on xbox live arcade, was the prospect of having online play for one of the most popular fighting games of all time. Too bad the online was slow, laggy, and had issues matching players up with superior opponents. For shame!
2. SVC Chaos: SNK vs. Capcom
When this game was announced for the original xbox, I was so excited that they were redrawing the characters and bringing SNK to the online forefront. I played it a lot and was happy these characters were redrawn...but the online was BEYOND BUSTED and never was patched as well.
3. Dead or Alive 4
You say you want a next-gen fighting game with online play? Yes I do! You get everything there, just sorry we couldn't get the online to work right. Bummer!
4. The King of Fighters XII
I wait forever for a new, online enabled, King of Fighters game. I get it! YAY!!! But the online is so broken, I couldn't get one move done right. That's if I was even able to into a match with this terrible player matching!