This past season of Law & Order: Criminal Intent when Chris Noth left the show (ya not technically the END of the show but still pissed me off). I'm mean come on, one of the most dramatic and intense episodes ever and they end it by having Noth getting pussywhipped by a preist basically saying "God says you should quit the force!" Noth walks out the door, cut to black. One of the oldest Characters on the show and they let him just fizzle out into nothingness.
Pathetic.
Or how about the Roseane finale? Oh, hey guys, just wanted to let you know that most of the stuff you've seen up to this point was really nothing but the rantings of an obesse, poor, lying widow.
In the realistic markets how about the old Robot and Junkyard Wars? Freakin' AWESOME shows with fun, cool premises turned to crap. 1-1 robot fights that required percision handling and excellent strategy to 20,000 bot clusterfucks. People turning bathtubs into helicopters to everyone just so hwppening to find "convieniently" nearly perfectly preserved airplane fuselages and jetskis.
Biggest dissapointment in a movie ending? The DaVinci Code, not even gonna go there, anyone who's read the book knows what I mean. Hollywood, are you listening? STOP MAKING CRAP MOVIES AND TV SHOWS!!! THE PUBLIC HAS HAD IT WITH YOUR EASY-TO-DIGEST, PALLATIBLE, STEREOTYPICAL B.S.!!!