LEGO Star Wars 2: The Original Trilogy. Thats my vote! I purchased that one as soon as it came out and unlocked as much as humanly possible. 99% bitches! Because that game is so gitched to shit and back. I was so pissed off at that game, yet so motivated to beat it.
Really though, LEGO Batman is a lot of fun. Can't really spend a lot of time on any single LEGO game though. The repetitive nature of those games has worn on me since completing The Original Trilogy.
Grr. The forced out POS that tOT brought forth... i'm still pissed at it lol.