The Settlers 7.
So freaking good. Super polished single player campaign and really well tuned multiplayer. It's a 9/10 game on all fronts, which is a nice change as the last two Settlers games have been awful.
Definitely one of the best strategy games I have ever played - amazing game. Currently playing this now and because I seem to only be able to focus on one game at a time, it means Dragon Age is on hold and Supreme Commander 2 has sadly been shelved for a while (and perhaps for some time as I can't play two strat games at once!).
So for me its currently Settlers 7 and Dragon Age - loving both but right now completely consumed by Settlers 7. Will get back to DA campaign once I finish Settlers 7 campaign and am playing skirmish games and then will be playing both!
Wish Dragon Age was harder though - far too easy on nightmare for me sadly.