This thread is about the worst level names, not the most overrated levels (and really, only the first one is overrated ).

All level names with glaring typos are annoying.
Distopia comes to mind.
So does Under Siegeness.
And Santranigus V (google it!).
Though they're certainly not the worst.

I think the worst names belong to battle levels—many people try to make them sound awe-inspiring or cataclysmic, and it just doesn't work (aside from Muddy Apocalypse, which I'm sure remains quite cool for its intended target audience of 13-year-olds), so I suppose names I really dislike are those ending with 'of death/doom/darkness/destruction'.