2) Blizzard - For Diablo 2, who has been patched and expanded alot.
3) Bethesta Softworks - The Elder Scrolls owns everything, and I love the way the games storylines are tied together.
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Entropia Universe - Foeburner Nighthawk Delta
Halo 3 & L4D - Ledish
Diablo III (when it comes out)
except Troika games is not active these days i think....
Then ofc Bethesda.
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As a RTS fan, Blizzard is my first choice: the Starcraft and Warcraft lines all produced awesome games.
I'd have to go with Blizzard and MicroProse for RTS games.
For MMO's I'd have to say CCP. Eve is a GREAT game and I really respect their development styles and philosophy. I think CCP has really thought outside the box and it shows in the quality of their world.