TF2!! I was a huge fan of the original (quake mod) and have been waiting years for this. I still kinda wish they went for more realism, but the graphics look pretty cool anyways (and realism would make it hard to explain rocket jumping). They better sell the game on its own on Steam or I'm gonna be pissed.
Tabula Rasa sounds awesome. I currently don't play any MMOs and have never paid for one (just WOW, Lineage II, etc demos), but if this game ends up sounding good I may give it a go. The fantasy setting is neat, but my real preference is for sci-fi, specifically post-apocalyptic futuristic settings (rifts, mad max, fallout, etc).
I liked the original Diablo, and if I really feel like a hack and slash, Hellgate London sounds decent.