I am pretty bored of it. I mean personally I can only take seeing the same characters, stages and fatalities so much at one time.
Perfecting combos is ok but since the demo is an old built I'm guessing the final game will feel a little different so If I decide to master a combo on the demo it might now work on the final game. I'm not gonna waste my time with that.
Plus I want training mode to practice combos. Doing it in the demo is an pain