I like playing Dungeons and Dragons every weekend. Well, technically it's Pathfinder, but Pathfinder is basically DnD3.5e+ or whatever. My group plays it as sort of a tactical minis game, in that we focus more on the combat rather than the roleplaying. Not to say we don't RP whatsoever, but we have a lot more fun with the fights.
The game has a lot of rules and there are *a lot* of monster out there, so things can get pretty complicated. It's challenging for me, especially, because I play a wizard so I have to come up with a finite list of spells each time we play. Can only cast each spell once, though I can make copies of a spell. So I have to pick and choose. Hmm fireball or see invisibility? It's enjoyable.