I downloaded the demo off of the PSN on a whim a few days ago.  I had never really gotten into an MK game before. I was more of a SF and MvC guy, but damn this game is fun! Playing with the DualShock 3 feels totally natural and the combos and special move timing seems much easier to execute than SF4 and even MvC3. I've really taken to Sub-Zero and have figured out a few good 35-38% combos. Only playing against the computer will probably adversely effect me if I ever start playing online but I'm sure I will learn to block more eventually. Overall, the demo has really got me interested in picking this game up. With Portal 2 on the horizon, it probably won't be a day one purchase for me, but I will definitely get it sometime this summer.