I thought he had potential, but that his potential was squandered. I actually liked some of the solutions that a superhuman with power would do- have a computer calculate which crises he should avert so that he doesn't have to spend all his time thinking about it (and feeling and dealing with all the guilt over it)- that was an interesting concept. I thought Bendis went too broad with it and it really should have been obvious to Tony and Cap that this guy was a ticking time bomb (didn't they JUST get done dealing with Wanda's craziness?!)
The Sentry was different depending on who wrote him:
Bendis Sentry- schizophrenic junkie with too much power doomed to self distruct (and take down others with him). Jenkins Sentry- troubled hero with a lot of potential trying to reconcile his dark side. The Jenkins Sentry is appealing. The Bendis Sentry needs to be put down like a mad dog.