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.
Sadly you could ask that question of Thor (Odinson) over the last 10 years or so. Who's he defeated outside of Bor (his grandfather)
The only Thor to beat nearly any and EVERYONE in a 2.5 year span is Jane