Hmm... the Internet sure is full of pompous asses.
Most powerful heroes? I dunno... Martian Manhunter, Superman, Spectre and Green Lantern from DC and Sentry, Captain Universe (no matter who it happens to be at the moment), Phoenix and Silver Surfer from Marvel come to mind. Sorry, I can't really think of a top 10 because I don't know much.
Cripes, I forgot Batman and Wolverine. Sheesh...
No PIS or CIS, Strange is simply one of the top five most powerful human super heroes in Marvel.
With an infinite array of abilities and no actual limit to what he can do, his power is hard to beat.
If you put Strange in the body of someone like....The Wrecker or anyone with superhuman strength/durability, Strange would be something not so far from Odin if not slightly more.