Wall-E - Only has like, 20 minutes of dialogue... the rest is just so boring. Even my mom hated it, she fell asleep through it and said it was the worst movie she's seen EVER.
Ones I watched but didn't bother to finish:
Twilight: Eclipse
Vampires Suck
Ones that weren't 100% terrible but were really disappointing
Ice Age 4
Scary Movie 5
The Internship
The Hangover: Part II
That's all I can think of for now.