As someone who really enjoyed MVC3, I'm very happy that UMVC3 exists. MVC3 really needed some design changes, plus, Phoenix Wright? Hell yeah. Plus, 12 new characters, new stages, new moves, rebalance, for 40 bucks? Seems fair.
So it kind of perplexes me when people talk about Capcom nickel and diming them. I didn't pay much attention to SFIV's growth, but were people this ticked off when it was announced? I sort of get the feeling that the people crying foul over this are the people that stopped playing MVC3 after 2 weeks, but maybe I'm wrong.
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Black Turtle did a pretty good job.