I've spent more hours on RTS games than all other genres combined, but I won't add any to my list. I don't think it's the games themselves which are so brilliant but the community and the competition which aren't things a casual player can just immerse themselves into.

So, in chronological order:

The Legend of Zelda: Ocarina of Time
The Elder Scrolls III: Morrowind
Star Wars: Knights of the Old Republic
Half Life 2 (including the episodes, if that's not cheating)

Those four games I have very fond memories of playing through.

SWKotOR is fantastic, I wouldn't be opposed to it replacing Persona 3 on my list, they both were enjoyable for the same fundamental reason to me.

No specific order:

1. The Secret of Monkey Island: Special Edition
2. Civilization 5
3. Jet Set Radio
4. Resident Evil 4

MI1: Special Edition is butt-ugly.

I can't imagine playing MI1 without those charming pixel graphics, especially in the dialogue scenes with Elaine and Carla. Their facial expressions were perfect.

Don't worry. I'd rate you a seven at a minimum!

I might replace DoW for Resident Evil II...I'm so conflicted.

The former has certainly aged way waaaaaay more gracefully, but you'd have more genre variety with the latter.

Plus 12/10 for the voice acting.

If I didn't have RE4 I'd have RE2, so I'd say go with that one.

Okay guys I'm switching RE2 for DoW...but DoW is fifth.