Hmm. Well, I can think of plenty of companies that have never failed my expectations, largely because I never had high expectations.
If I assumed that "failing me" included expecting good games, Team Ico would be the only one to never do so: both their games were elegantly refined and beautiful. Black Isle would be the second closest, before they shut down. Troika released several buggy, unfinished games (that is, all of its games); Blizzard's games are solid, but don't innovate to a large degree (and innovate very little outside of game mechanics); Bay 12 Games's development times are long (but understandably so because of the load of features being added).