Not about to defend Cates. But I'm pretty sure those aliens does have some kind of superstrength at least on par with standard Asgardians. Because in the panel with Volstagg, Balder is physically restraining one of them and it looks like it takes at least effort on his part to do so.
Also there's a Random Asgardian in the back whose being threatened, the Alien is holding his arm in a sturdy grip and the Asgardian is clearly surprised at his predicament. So these are likely not just Average human-strength extraterrestrials. They are also larger than the Asgardians which might indicate that their strength is superior.
Also, I think I'll view the rock to the back of the head as sort of a critical hit. Yes Thor can tank planet-busting blasts but he was ready for that attack, he could brace himself. He also still has a central nervous system and that rock (especially if flung by someone with some level of super human strength) might have hit him in the back of the neck and blacked him out for a few seconds. No real damage was done but he goes on his knees.
Re-reading the panel, I realize my memory has been fabricating things. It's not just a tiny, fist-sized rock. It's a fucking boulder. These aliens are clearly superstitious cave-men aliens with obvious super human strength. They're tossing 150 kg boulders around with enough force to launch them several meters into the air. Thor's also obviously fighting them, he's not just trying to hold them down. They're not five-year olds to him. That's the wrong analogy to use here. If he is The Mountain/Hafthor Bjornsson then they are 1000 eighteen yearold athletes. He's still stronger than them by magnitudes but they are juuuust strong enough that when there's 10 of them and only 1 of him, he has to take it seriously. He clocks one with Mjolnir and the Alien's head does not just explode in a pasty mist so they're clearly also durable enough to survive a beating from Thor.
Now, I get it. It's not been long since Aaron left. The wounds are still fresh. It is easy to be defensive and look for excuses to say "thor still sucks". We've been burnt before. Some might not want to let their guards down. But this comic is not as bad as some say. Those complaining about wonky power levels are, as far as I can see here, a bit wrong. Thor isn't shown as "weak", not to my mind. Refute my points of someone think they can but I think this is a good showing for our favourite Asgardian.
He IS noble, he has principles, he is powerful but he is also still very much a Viking God. I'm actually interested in seeing where it's going. Not just hoping for scraps from Jane-thor's table.
Also. Just saw the 1994 fantastic four episode to battle the living planet. They're laying it on THICK with the Thor worship. And JRD has the dialogue down to a T.