Best game series

Jedi Knight,Age of Empires,Red Alert.

Final Fantasy series (1 to 9), Crash bandicoot series (old ones), Metal Gear series, Resident evil series (old ones), Silent hill series, etc etc ....

The Elder Scrolls & Trine !

PacMan

Metal Gear Solid !

Assassin's Creed.

Battlefield from 1942 to 2142. later was something like battlefield, but not battlefield ;]

Fire Emblem

AC, Cod, GTA, blerrrgh

Megaman/Rockman series never get old.

Also, clicky

BioShock series :)

1. The elder scrolls
   2. grand theft auto
   3. fallout
   4. Call of duty
   5. medal of honor
   6. assassins creed
   7. far cry
   8. tropico
   9. battlefield
   10. quake
   11. total war ( like napotion total war mediaval total war shogun total war )
   12. F.E.A.R
   13. civilization
   14. lost planet
   15. fable ( fable 3 is a fail just like the jurney )
   16. black & white ( my favotire god game too bad there is no B&W3
   17. space rangers ( best space strategy game of all time)

Warcraft, Diablo, Resident Evil, Call of Duty (up to MW2, rest is ....), Quake, Unreal, and so many more.

zelda , mario, metroid, resident evil to 4 and the rest is sucks !, crash 1,2,3 ,

Metal Gear is the best saga Ever
And Rockman X/ Zero / Legend Series i love Rockman... i Hate Capcom, but i love Rockman
And Half Life, of course
And Quake...

Monkey Island, C&C and Diablo comes to mind.

Half-Life, Metal Gear Solid, The Legend of Zelda.

Half-Life is the best.

Kingdom Hearts

Total war nothing more nothing else :P

Batman

Assassin's Creed

Half-Life

Hitman

Metal Gear!

For indie games it is so Trine. :O

Probably Portal and Mass Effect for mainstream games (I've only played the first two ME so inb4me3sucks.)

ALlways and forever Baldurs gate