I've been hooked on Starcraft 2 since release. Blizzard sure know how to make fantastic games. Wow's PvP was never really balanced but it was still really fun and the combat system required a good deal of skill.
Been beta testing Guild Wars 2, everything looks solid apart from the horrid combat system. It's so clunky and slow when compared with Wow's. It feels like there is a lot less skill required, I just mash the buttons that are off CD.