I know I'll get a lot of hate for saying this, but I think Mario games are extremely overrated. Don't get me wrong, I absolutely love Mario, but come on, there are other good platformers like Sonic or LittleBigPlanet.
With that aside, I bought Mortal Kombat Arcade Kollection the other day. I love it, but the games are pretty frustrating, especially MKII. In all three games, you have to find some kind of crazy exploits and combos to even stand a chance against the AI.