A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,006
Titanium is worth achieving (over Platinum) if you don't have Star Alliance status but need to fly it a couple times a year.
Titanium is worth something at full-service Marriotts outside the U.S., although I can't speak to the Plat vs Titanium difference since I've been LT Titanium since Titanium launched.