When he starts ripping people's heads off the Superman comparisons might stop.
Ares' ripped-in-half corpse agrees with you.
I don't care for the Sentry, what little I know of him. They tried way too hard and made him too powerful with no interesting characteristics. Well, ok, he's a mentally disturbed junkie that stole a super-soldier serum to get his next high and it somehow turned him into one of the most incredibly powerful beings in Marvel who can have his other "personality" take over and kill everything. But those bits aren't interesting by themselves.