I'm sure that's certainly the case for some people, but it'd be pretty ignorant to say that there aren't people who hated MK9 as a game. I've definitely met people that do. They sincerely just don't want to play the game and can't comprehend that people do. We don't know whether or not these players in question did, but it's not really up to us to pretend to be experts on unnamed testers' opinions.
Unless you've got the roster of testers and their opinions of the game are well documented hither or thither, let's not try and speak for them.
And I've met and talked to people who hate games like SF4, Marvel3, Persona4, GG, Tekken and MK9 but they sure as hell do not go around trying to start flame wars. They just accept that it's not their type of game and go on about playing what they like.
And while I'm not going to pretend that I know who the tester's were, I think it's safe to say that it wasn't only MK9 players. It's obvious at this point that they took some of the biggest names in the FGC and had them play it. Otherwise, I don't think we would be getting as much "oh, SF player would love this because they did this different this time around" talk as we are.