Originally posted by Blue Area Vet
I don't think the author tried to hard to make a weakened mental state obvious. Just screams of an excuse, and I mean for ANY character. A strong mind helps you in a fight, correct? Hell, don't give the Superman fans another excuse.
Some things aren't always specified or directly hinted at in comics. In SIEGE we know that Thor only was able to kill Sentry because Robert wanted to die. Bendis then later said that he didn't want to include a line where Spider-Man says.
"Damn - If Sentry didn't want to die we wouldn't have killed him."
We have many hints that Molecule Man wasn't fully right in the head at that time. He had created images of people such as the Beyonder, Dormammu and Mephisto who were telling him what to do and how to do things. You can't always have a direct hint in the comic that something is true or not. The author will instead leave little nuggets of information because if he has to add a big hint then it feels forced and breaks immersion.
Originally posted by Blue Area Vet
Weak mindset or not, Owen is the master of his power set. Sentry was less than a neophyte, he didn't even know how he was doing the stuff he did. Owen should have DOMINATED him, and he lost. What happens when Sentry gains just a little experience?
If Owen is unstable thereby a bit weakened then no matter if he is using all that he can at the time he still wont be ale to make it count. I still think that feat is a very good one for Sentry, Despite the fact that Molecule Man was weakened nobody can deny Owen still ha a degree of control over his molecules and was still extremely dangerous. And he presumably was trying to resist having his molecules being controlled.
Going on your example about him being experienced and stuff. Sentry we know has the power in him to defeat the Void when he is stable. Able to emit energy that can destroy entire worlds while holding back. Yet when he fights Hulk during the WWH story line he can just about manage a stalemate. While Sentry is naturally extremely powerful if he can't control his power or he's weakened he just wont be able to reach the upper echelons of his power.
Sentry may have been new to this whole Molecular Manipulation game. But him being able to do what he did could be more testament to his raw power when it comes to that. He just has an extreme level of power with his molecules which happened to help when fighting Molecule Man. Sentry seemed to have control over his powers in Uncanny Avengers if you wanted to have a look.