I felt it was a good bookend to generations in that regard.
I will say that they should have kept in the deleted scene were he's meeting with the Romans. It established how he's spent years powerbrokering behind the scenes. There's almost 26 mins of the movie that shouldn't have been cut out.
https://youtube.com/watch?v=DbfKapTFs8s:346
Nemesis is rather quaint these days in how it doesn't hold the audience's hand and assumes people are paying attention. I miss those times.
Half of Nemesis is the most badass fight in star trek, how is it not fun?
https://youtube.com/watch?v=56iTxduUacs:38
We all love that episode, but I feel like your missing the point. This isn't about an alternate Picard. It's about another soul, born to be a replacement for Picard, discarded and forced to forge his own destiny. I consider this one of the best clone movies ive ever seen, in how it examines the impact that would have have on a clone's psyche. Just the sheer yearning to step out of the shadows and not be judged for appearances sake.
https://youtube.com/watch?v=smbD8A8JI9g:135
Nemesis does, but it feels less like a ripoff and more of a homage to me. its biggest failing is probably the fact that it relies too heavily on continuity for it to make as big an impact on normies.
As I said before, Shinzon needs Picard's body in order to survive and beat the clone degeneration. He likely wouldn't have gone after him in the first place otherwise, but his calm measured approach starts to break down as the movie progresses. Then he starts getting more and more unhinged. I really like the make up that depicts him slowly falling apart throughout the film.