Joe Hart will never be lauded like De Gea, Neuer or Buffon etc. He's at City and he's English.
Sure he's not perfect, but he's saved us far more often than he's cost us. We should always been looking at improvements to the squad, but Joe is miles off being amongst the weakest links.
If there are 4 or 5 better keepers, that's not bad going... I doubt any of the (alleged) better keepers are available though, and if they are, they're probably old (Buffon).
I'd much rather discuss how he could improve than discuss who would be better.