The problem as I see it is simply this:
In Nemesis, we are asked to believe that someone that looks like a 17 year old kid is going to tangle and hold his own with a respected mature captain like Picard, AND we are asked to believe that this person IS Picard, only younger?
It just doesn't work. Like I said before, it may have worked on Paper, but it didn't transfer to the big screen. The sad thing is that there's simple things they could have done to fix this problem. For one, don't be pretentious in your introduction of the character. What was with the waiting 18hr or whatever it was, and then all the secrecy about who he is, even to the last moment when he slowwwwwwwwwly steps into the light for the big reveal that....gasp!......he looks just like Picard. What was this supposed to prove? Was it some lame attempt at trying to convince the audience that this person was Picard's clone? Why is he bald? Why is he taking FOREVER to get shit done????
But...but...they gave him the fake nose to match Stewart and everything!