I gotta agree with the Star Wars prequels.  Three shots and not one of them hold a candle to any of the originals.

A.I. - a fundimental flaw with this is that 'robot's aren't sentient!'  They should have told it from the perspective of the humans.  It started out great and then went grandually down hill from there.  

To me, this was a simple story about how a family tries to fill the void of losing a child with a robotic substitute - a very relatable situation that should have provided insight into the human condition.  Unfortuantely this storyline is abandoned about a third of the way through and shifts perspectives onto the robot.  Unless you happen to be a mecha in real life, there's nothing to relate to.

Oh and as for one that died while In the movie, lately I would have to say 1408. I was actually pleseantly surprise with this film for over half the film. Around act three (i won't spoil it but it's when the movie gets "wet") it just goes all to hell and looses all momentum. If this didn't happen, i think it could've become the sleeper hit of the summer. oh, well.