-Incredible. Much better than console versions there are tons of great mods out there. Note: I don't think it works on Windows XP.
-Yes, perfectly. Automatically switches button prompts, turns on rumble, etc. the instant you start using the controller.
-YES YES YES and buy the Black Market Aerial Pack DLC for 50 cents. It has the parachute boosters, which allow for mods like superman flying.