Bethesda
Insomniac
Naughty Dog
Valve
Level - 5

i liked square but now i like level5 more

I guess its First party exclusives that make a console, but consoles would be nothing without 3rd party. Look at the N64; great first party, no 3rd party.

To answer your question I support:

- Bethesda (Oblivion/Fallout 3)
- Geurilla Games (Killzone 2)
- Insomniac (Ratchet & Clank/Resistance 1/2)
- Infinity Ward (Call of Duty 2, Modern Warfare 1/2)
- Naughty Dog (Uncharted 1/2)

I do NOT support:

- Epic Games (Gears 1/2)

Nintendo as a whole

Kojima Productions

Team ICO

Media Molecule

Retro Studios

Guerrilla Games

2K Marin

Insomniac

Naughty Dog

Square Enix

and more

Bethesda
Bioware
Obsidian
Epic Games
Harmonix
Nintendo( Zelda team, Mario Team etc.)

and whoever else make great games.

Bethesda Softworks // Guerilla Games // Naughty Dog // Kojima Productions // Monolith Studious // Blizzard Entertainment // Free Radical Design // Harmonix // Nintendo EAD // Factor 5 // Silicon Knights // 2K Marin // Rockstar // Bioware // Intelligent Systems // Tri-Crescendo // Valve // Seeds // Clover Studios // Platinum Games // Sega // Capcom // Suda51 // Criterion // N-Space // Infinity Ward.

Jup, that's about it. But I must've forgotten a few!

Monolithsoft
tri crescendo
Retro studios
Nintendo
QQQ but they disbanded and went to square enix
so now of course square enix.