This really is not the worst of the Trek films. Two reasons why Nemesis did poorly. One, at the time the film came out the public in general was worn out with Star Trek. Voyager had just completed it's run and Enterprise was in it's second season. Two, the film had things that were a bit outlandish, i.e. the ridiculous size of the Scimitar. Plus the fact that the old cold war mentality of the evil Romulans was pretty much played out in the Trek universe at that point. As a trek fan knows the Romulans were a silent enemy of the Federation for 200 years. Then you have the Dominion War and the Romulan Empire joins the Federation Alliance and helped to defeat a ruthless power, the Dominion. Which made all of the other enemies look like kids in a sandbox. So reverting back to the cold war idea just didn't work. And having the same kind of ending like Spock's death in Star Trek II like Data's here, it just sank. On the other hand the idea was great and it worked to an extent. The Romulan Senate is something I have always wanted to see and given the fact that no other Star Trek movie has really gone into the Romulan race, I thought that that was a great theme. This film is one that I continually enjoy to watch and definitely put it above Star Trek V and Insurrection.
Review of Star Trek: Nemesis
