Past several years? Hmm.

• Plants Vs. Zombies
• World of Warcraft and its expansions
• Civilization 4
• Sins of a Solar Empire
• Company of Heroes

It shouldn't be. Anyone who lists Gears as exclusive, and not console exclusive is technically wrong.

1. Warcraft 2

2.  WoW

3. Sim City 3000 Unlimited

4. Gunbound

5. Guild Wars

Guild Wars

World of Warcraft

Asherons Call though it is much older

I think just a few mmo's is all I cared for and I do not even care for them anymore because I am to busey to keep up now.

"This gen" PC games (i.e. released after DS/PSP) which I love and still play today:
Civilization IV
Audiosurf
Anno 1701 (a.k.a. 1701 A.D.)

...and the ones I really liked:
The Whispered World
Machinarium
Auditorium
Runaway: A Twist of Fate
Darwinia
Edna & Harvey: The Breakout
The Book of Unwritten Tales
Drakensang: The Dark Eye
Ceville

All my favourite PC games are from the 90s though:
The Secret of Monkey Island, Monkey Island 2: LeChuck's Revenge, The Curse of Monkey Island, Grim Fandango, Indiana Jones and the Fate of Atlantis, Maniac Mansion: Day of the Tentacle, Civilization, Civilization II, Dune II: Battle for Arrakis, Command & Conquer, Age of Empires 1 2, Warcraft 2, Dungeon Keeper 1 2, Syndicate, Magic Carpet, SimCity 2000, Baldur's Gate, Betrayal at Krondor, Lands of Lore, The Settlers II, Master of Orion, Wing Commander Privateer, System Shock, Heroes of Might & Magic III,... Ah, what a decade.

@Chairman-Mao: Civilization IV IS a PC (Win/MAC) exclusive game. Civilization Revolution for 360/PS3/DS is not a 100% port of the PC game (it would be unplayable). It's a well-done, streamlined, stand-alone Civ version for console/handheld.

Battlefield 1942
Company of Heroes
Crysis
Baldur's Gate 2
Age of Empires 2
Age of Empires 3
The Settlers 2
Anno 1404
Heroes of Might and Magic 3
Civilization 2

no particular order

1) Civilization IV

2) Age of Empires III

3) Torchlight

PC hottest Games (not exclusives):

Mass Effect 2 and Splinter Cell: Conviction!

Within the last 4 years:

1) Civ 4

2) Gal civ 2

 3) Iracing

4) Sin of the Solar Empire

5) Mount & Blade

 6) Rfactor

7)King Bounty

Hah, gunbound... that's a fun game... my only issue is the lack of the adventure mode.  It focused mostly on PVP when to me BY FAR the best part was the 4 person team ups vs mobs.

I wish they made more MMOs based on fighting like that rather then the repetitive take turns bonking each other style.

my fav has to be the age of empires franchise a have not really liked payed many other games on pc it is mainly on console.