Everything I've heard about it indicates that the inputs can be extremely unforgiving.
I'm all for precision in a fighting game mind you, but there is something very frustrating about near-perfect inputs being pointlessly misinterpreted by the game.
That certainly isn't a deal breaker, though. Just something to keep in mind.
I didn't really notice this. Maybe they're talking about stuff that happens at higher level play? Things happened how I'd expect them to. Maybe these people are SF4 players!