see title, say 2 - 3 years but I would perfer last year if possible.

Go!

In no particular order

Sins of a Solar Empire
Crysis
Bioshock
The Orange Box
Company of Heroes
World in Conflict
WoW: The Burning Crusade
1701 A.D.
The Witcher
Medieval II: Total War

I don't know if I'd really call it my top ten list, but it is ten good games that came to mind.  Oh, and if Civ IV counts, throw that in the list too.

1. Crysis
2. Age of Empires 3: The Warchiefs
3. Counter-Strike: Source
4. Bioshock
5. Portal
6. Quake 4
7. Garry's Mod
8. Stranglehold
9. Company of Heroes
10. Half Life 2

I believe you didn't list yours ssj12.

oh my list will be apart of my VGC special. =P

Does the orange Box count as one game, 3 games, or all 5 games? You of all should know that good PC games stay good and favorites for ears and years to come, there's no rotation every 2 - 3 years.

Portal
TF2
UT2004 (Is that pushing it?)
HL2 (and episodes, esp. 2)
BioShock
WoW (or BC if you want a more recent one)
FEAR (not expansions though)
Audiosurf
Civilizaton IV
The Witcher

I really can't come up with any that instantly WOWed me, i actually I had to look through these lists for the last 3 to make sure they were withing the boundaries.

Portal
HL2 (episodes)
TF2
WoW (BC)
Crysis

I am not sure I have got 10 in the past few years, but anyway....

Rome Total War
Company of Heroes
World in Conflict
Company of Heroes Opposing Fronts
Medieval II: Total War
Star Wars Empire at War
Spore
Empire Earth the Art of Conquest (would be higher but I moved it down due to its age)
FIFA Manager 08
Empire Earth II

The Guild 2
Witcher
Dwarf Fortress
Mount & Blade
Crysis
...
Not in any particular order. I think everything else have been subpar. Mostly crappy multiplatforms & stuff.

1. Portal
2. Sins of a Solar Empire
3. Europa Universalis
4. Audiosurf
5. Devil May Cry 4
6. Fahrenheit (Indigo Prophecy)
7. The Witcher
8. Assassin's Creed
9. Spore
10. Command & Conquer 3

I had some troubles making the list, I haven't played many new PC games