Merkuri
Explorer
Bascially, two companies can put out a product, and I'll play it: Bioware and Rockstar.
Another company that finds it hard to go wrong is Blizzard. Diablo, Warcraft, Starcraft... I haven't played anything by Blizzard that I haven't loved. They've defined the RTS and MMO genres for me. I can't play an RTS without comparing it to Warcraft III or Starcraft, and I can't play an MMO without comparing it to World of Warcraft.