I rented it a week ago and I really enjoyed it the 5 days I played it, I played mostly with Ryu, but I tried to play with everyone. Yatterman-2 was the only character I didn't unlock. If I had the game I probably would main Zero and Ryu, but knowing myself I would probably play with anyone just for fun. One thing though, I was really disappointed with the wii remote and wii remote nunchuck simplified control scheme so I had to play with my gamecube controller (since I don't have a classic one).
I would like to buy it but I don't really think it is worth my money, at least not with the current price that is, I'm gonna wait some time until the price drop.