well here are some FPS
TF2
AVA
S4 League
now i know you said no IJJI but trust me: AVA is worth the crappyness that is the launcher. the gameplay is epic, the story, the modes, the weapons, classes, everything rocks.
S4 League is a type of football that involves guns and stuff, but its not as boring as you would think, it has lasers and basically really epic cartoon graphics, almost manga type 3D graphics. trust me that one is also a keeper.
TF2 is godly, nuff said.
a good add on if you get TF2: Garry's Mod, its like a sandbox where you can literally make anything you want from the game materials like rockets, bombs, etc!
MMORPGS:
Windslayer
Grand Chase
Fiesta
Dragon Fable
Adventure Quest
Flyff- sucks-
S.U.N
i hate flyff, boring as hell, it relies on grinding, dragon fable and AQ are really kinda childish, fiesta is alright, Grand chase is beastly, and windslayer is a really old 2D side scroller. S.U.N
is, hands down, THE BEST mmorpg i have played in a looooong time. another ijji, but if you can get past the launcher, it is so beastly, you will get hooked the first try.
some good RTS
Navy Field
navy field is where you control a ship, and through leveling - and careful choices in the ship tree- you can either command a submarine, battleship, carrier, light frigate, or a small destroyer the farther you move up the chain of command. a birds eye view of the sea game where you control a single ship and fight with other real people and their ships. addicting, and it makes you think ahead and make snap decisions! EPIC FUN FOR A STRATEGY GUY!
and i had this other game it was like Blitz 1941 or something where u command a single tank and u play with other tank ppl n stuff ill try to remember.