For all the flaws of Nemesis it still ended up being a superior movie to the Abrams trash of fail.
The biggest problem with Nemesis was the story was just not there. It wasn't a good story and, as a result, the movie wasn't very interesting. The forced cameo of Janeway didn't help things either. Drop the Remans, drop the clone issue, drop b4 and just start from scratch. TUC was a nice send off for the Kirk crew. This was just a slap in the face to TNG. Using the Romulans was a good choice but they didn't even end up being that big of a deal. It was quite frustrating.
Everything about Nemesis was frustrating.