But if I were Professor X I'd have about 9 Ph.Ds and would never not know an answer to a question. I'd just read the mind of someone across the planet that knew the answer.
Pretty much everything around us has some form of metal in it so Magnetos powers would be pretty useful.
If I were the Juggernaut, I'd have the most prolific football career ever (with Colossus' strength, he could do the same I suppose).
If I could shapeshift like Mystique? Shiiiiiiiitt. I'd be Brad Pitt one night then Idris Elba the next. I'd be getting all kinds of pussy!