For right now, Vegas is good for an FPS, Company of Heroes would be the best bet for an RTS and Oblivion/NeverWinter Nights II for an RPG. As for MMO's there's little recent releases, personally I'd still go with WoW (get yourself a trial account and see if you like it) if like many you have yet to play it and still hate it try Guild Wars which is also fairly good.
However in a month or so the mothership of this years multiplayer FPS gaming will be arrive, if you don't buy this you deserve to be shot.
ET:QW
Release Date: ~Late February/Early March
The spiritual successor to Wolf:ET (which I suggest playing [it's free]) and the prequel to the Quake series.
It will be a mainly (if not completely) multi-player game with a focus on squad work with the use of support vehicles and deployable objects used towards a team goal (offensive or defensive).
Do a little googling, if this game is as good as it really should be you can think of it as how BF2 should of been.
By that I mean:
Great Engine - Better than BF2 graphics and the recommended specs should be about the same. God hoping there will be few if any bugs and a support team who have their act together
Great Gameplay - Objective based missions with constant campaigns running on servers (difficult to explain) which necessitates squad work and diversity
Decent Ranking/Unlock System - You are awarded points much higher for actions which help your team, not just killing and reviving, for instance you'll get more points for setting up a bridge or deploying radar than you will for killing a single enemy. Unlocks are awarded by your actions in a game/server so when you do well, you are awarded little bonuses. Theses are not carried on if you log out and back in and must be earned again meaning when you join a server you are at an completely equal standing to anyone else
Parts of that are a little presumptive and assumptive as it's been taken from all the interviews I've read