Remember the Ultimate Universe version of Thor. The space hippie with the oversized ax/hammer combo. I know comics often talked about how powerful and tough he was supposed to be. But did he ever win any battles against enemies around his level or higher without extenuating circumstances? All I remember him is either losing battles against anyone one his level or his few victories against characters on his level having some important detail that skewed the fight in his favor.
From what i remember, he kind of beat the reality manipulating Loki, managed to knock out a pym enlarged hulk by hitting him in the back of his head, and pushed Galactus back into the negative zone.
There are caveats for each one of them though. He kind of was more hyped than what he was actually used for.