I liked the new Star Trek movie OK, but felt it would have been a stronger film had it not shown Kirk's dad dying. That whole sequence felt unnecessary and awkward.
If by unnecessary and awkward you mean the best bit of the film, then I completely agree.

As for movies I love, sequences I hate - I cant say I have any. The closest I can think of is Chris Tucker in the Fifth Element, but if theres a part of a film which is so terrible i'd hate it, it tends to ruin the whole movie for me.