Yep, I don't like this. I hate Sentry. There's just something gimmicky about this guy. It seems like they're trying to cram this overpowered punk into wherever they can fit him. I mean, he beat Terrax (not too hard to do, since he's the weakest Herald IMO), but still, he beat a Herald. That's big. And then there's the million suns thing. Like a few other people said, if he really had that kind of power, wouldn't his punches destroy the planet? Now, here's what I think. One of the writers said that not everything is as it seems with the Sentry. I think a large part of his powers are mental, smoke&mirrors and more subtle. He may be strong, fast, (*cough* superman clone *cough* 馃槢 ) etc, but the void part may be the only redeeming thing in his character. It opens up new avenues to just what his true power set is.
Anyway, I'm pretty sure Mar-Vell goes down hard.