OK, so I have this and I've actually been playing it online.
First, the online plays better than the console version, NO DOUBT ABOUT IT. Wired on FIOS is just fantastic...and I've also played wirelessly on FIOS and it was easily better than wired on either console.
Now, a few tips for people not as used to PC gaming.
Remember, when playing PC games online, you have to prepare for the lowest common denominator. By this, I mean, you have to assume that there will be people who's PC's are JUST BARELY able to handle the game...or possibly not even capable but they're pushing it anyway.
Because of this, the games will attempt to sync, even if the users are using different settings.
1. Keep your game set at 720p for online games. (for offline, go nuts with whatever settings you want)
2. If your PC can't even handle that, then use the lowest settings the game allows...and pray
3. Just like console, try to stay on a wired connection when possible.
In terms of controllers:
I have found that a number of devices work well, and others do not.
Here are some recommendations:
-Xbox 360 Afterglow controller. Good d-pad, highly recommended.
-Xbox 360 Mad Catz sticks. Oddly, I was unable to get the PS3 version working natively with this game. Might have needed the driver. I will update tonight or tomorrow.
-PS3 MAD CATZ products, as long as they have a "LS" or Left Stick (as in Left Analog Stick) setting, it will work fine on this game.
-PS3 Mad Catz SF4 Pads, SFxT pads and Arcade Sticks will all work as long as the switch that says "LS DP RS" is set to the LS setting.
-PS2 pads with the HDE converter (this thing)
However, MAKE SURE to set it to 360 mode.
**Note** If you have one of these converters that DOES NOT have a ps3/360 switch on the side, it will ONLY recognize the diagonal directions on your pad's analog sticks, but NOT on your dpad.
I have not yet tested any other PS2 converters, so I don't know if the etokki or inpin will work yet.
Controllers with problems:
-Official Sony PS3 pads: will not natively work and will require a program to work. Could slow your pc down.
-MLG PS3 pad: Diagonals not recognized on dpad, only on analog.
Controllers still to try:
-Xbox 360 PDP MK Stick(I no longer own a PS3 one)
-AIAB PS3 MK Stick
-AIAB dual modded stick
Updates coming soon.