I like Benedict Cumberbatch, but he was a horrible choice to cast as a replacement of Ricardo Montalban. Granted no-one can replace that iconic role, but Cumberbatch was really out of place.

In fact, about the only casting selections I really like in the new Star Trek movies was Karl Urban as Bones, and Bruce Greenwood as Pike.

Edit: I missed the part in the OP that says movies you liked. I wanted to like Into Darkness, but they did a very poor job on that one.