I kinda felt the opposite, that this was the easiest class to level, but without real high end potential. I felt like the toon was finished at 40, which has never happened before. Well thought out class, smooth ride. Took all 18 class abilities (Fire/Rad). But Epic adds next to nothing. Incarnate will of course add stuff, but it won't put me over the top on anything.
Sents will never tank, I think anyone expecting that will be disappointed. But they can put out plenty of damage, especially with zero downtime and never worrying about mez or staying alive. It feels like a hero when you play one. They really bring a lot to a team when it comes to taking down AV and GM, too.