I love Capcom's fighting games.  But I already said that in the title. 
 
I suck at Capcom's fighting games.  But, again: said it in the title. 
 
However, I think it speaks volumes about the quality of said games that I have a great time needing to play my best (which obviously isn't very good) to beat the CPU on normal difficulty and get my ass handed to me if I make the mistake of playing online.  How many games is that true for? 
 
MvC2, Marvel Super Heroes Vs. Street Fighter, Street Fighter IV, and the various incarnations of Street Fighter II are some of the most fun I have with video games.   The Marvel crossover games are just so over-the-top and ridiculously fun.
 
That's all.  Not the most incisive blog, but I think it's really rare that a company can make games that appeal so broadly all the way from pro-level players to schmucks like me that have a hard time doing dragon punches on cue. 
 
Edit: to open it up to discussion, I feel like asking if there are any games anybody else in the community can think of where they can barely handle the A.I. on lower difficulties and get wrecked online, but still have a great time.  So chime in!