Four stars is hefty for a comic book flick and I'll it that I have a bias towards Sentry/The Void. It's a guilty pleasure watch for me that's probably closer to three stars for most others. Whatever, I loved it.
Sentry is neat because he has Superman levels of power (and beyond, in some ways), but he's burdened by mental health issues, resulting in The Void taking control.
If you've watched any number of MCU movies, you'll see that every…