I would say Ultimate Marvel vs. Capcom 3. I like fighting games, both watching and playing, but I've never been great at this series (I did buy MVC2) and never really wanted to play myself. I've watched matches at EVO and other tournaments and it's still fun to watch.
Congrats to azuarc for winning the guru contest.
"Love is patient and kind; love does not envy or boast; it is not arrogant or rude." - 1 Cor 13:4-5