I don't trust any 100%, but there are a few to which I will give the benefit of the doubt. Bioware, Bungie, Valve, and even Ubisoft. I know their Wii offerings are less than stellar, but I don't own a Wii and I love Prince of Persia and Splinter Cell. Endwar is also looking very promising.

None. Even Nintendo (the company I prefer-read again-not worship) does games I don't buy. Square-Enix too... I don't like FF Tactics, never played Dragon Quest and don't get those FF spin offs.

Um well if there was any developer that was even close I would say Bioware. I just don't think they've made a bad game. Of course they've really never tried anything risky so who knows.

Blizzard. When they still made single-player games I would simply buy every new one and it would ALWAYS be the best game in its genre.

EAD
Black Isle studios(theyre dissolved now but i had every one of their games)
Team Ico(2 shots two home runs)
Polyphony (always setting the bar a bit higher)

Square, Konami, Sony and Insomniac. There are exceptions of course.

Black Isle ( i don't know they still exist)
Bioware always made quality titles
Blizzard
Nintendo

Nintendo

insomniac and naughty dog to make great games. the ff team(s) to at least make very solid good games for the main series.

i used to trust sakuchi (ssb) but he let me down with his design choices in brawl, brawl is only a good game to me. he could get that back with a damn good ds ssb.

Nintendo, not 100% but 99%^^