Lame humour, a weak plot, and really crappy special effects. Paramount actually saw the sense in denying William Shanter's request to try to re-do it with proper special effects... the changes probably wouldn't move the film any higher on this list.

Yes, they cloned Picard in this film. The whole damn film seemed like a weak clone of Star Trek 2... super weapon, zealot intent on killing the protagonist, need I say more?

It simply felt like a long episode... Picard trying to be a rebel to save a special someone. Hmmm... sounds like a rehash of Star Trek 3.

I hate to have Generations on this list, as there were parts of the movie I really liked. The two that qualify this one for this list are 1) killing off Kirk, and 2) nuking the Enterprise-D.

Whales? Seriously? It was funny, but it set the stage for the craptacular ST:5 in terms of plot.

Adapted from what was supposed to be a Star Trek episode, the movie never seemed to fit together. While some of the visuals were beautiful, it was simply too long, too boring, and too stiff in the acting department.