To describe someone as “the best actor in TNG” obviously falls into the category of damning with faint praise. 
What prompted my previous post was going to see Waiting for Godot on Wednesday, this production has a very impressive cast list: Ian McKellen, Patrick Stewart, Ronald Pickup and Simon Callow. And it struck me that Patrick Stewart looked a little uncomfortable and stiff, in particular with the physical comedy aspects of the production.
Basically, what Linnie said.
I would sit down and watch Patrick Stewart in almost anything (but I gave up on Eleventh Hour after one episode ‘cos it was just dull) but there’s a certain type of part he does very, very well and outside of that he’s still good but not the greatest.
Very True Mood: 
mischievous
mischievous
I’ve been trying to come up with a witty and intelligent response but I’m failing misserably. I’ve absolutely no problem with the idea that he could be better at some roles than others. A bit of specialisation never hurt anyone (in fact I’d say it was a good thing in most jobs). Sometimes I think some actors (especially ones who don’t seem to have a problem getting work) make too much of a thing about worrying about type casting.