Poor Shenmue was ahead of its time...Over all, Sega used to be an awesome developer, but now...They seem to WANT us to hate them. I will say, F-Zero GX for Cube was probably the best game they've done in the past couple years.
Well, as for me, my favorites include:
Konami (Metal Gear Series, Sparkster Series)
Bandai/Namco (SC, Tekken, Tenkaichi, Kinnikuman Series)
Nintendo (Fire Emblem, Smash Brothers, Zelda, Metroid, Kirby)
Square Enix (Kingdom Hearts, some Final Fantasies, Bushido Blade, Star Ocean)
Blizzard (WoW, maybe Diablo 3?)
Capcom (Mega Man X, Zero, Resident Evil, almost all their fighting games)
SNK (KOF series, Fatal Fury)
Treasure (Dynamite Headdy, Gunstar Heroes)
Atlus (Odin Sphere, Persona, Trauma Center, Arcana Heart)
Clover (dead) -(Viewtiful Joe, Okami)
Hudson (Bomberman, Bloody Roar)
Bethesda (Oblivion, maybe Fallout 3?)
Thin Ice:
Sega (Quit whoring yourself out, and make decent games again)
Lion Head Studios (Fable II better be good)
Midway (Never was a big fan, all their games seem like they have low budgets)
EA (Too many mindless sports games, and not enough for the non-casual crowd)
Bungie (Is Halo really the only game they can do? It's good, but where's the rest?)
Studio Gigante (Burn in hell)
Not much else I can think of off the bat, but this'll do for now.