All characters get overrated by their fanboys, and the only characters that don't get overrated are fodder garabage...like Kiba. But characters who are good or have potential are usually overrated.
(these two^ have been getting it alot lately)
Tsunade (she's the least deserving in my opinion)
There are many others, but I'm too lazy to type all of them. I didn't include Hashi or Madara because they've shown that they deserve every bit of respect they get. I've just been seeing people complain about Minato and Itachi being overrated but it's not only them, every character has bias fanboys that overrate them. Some characters on my list are far more overrated than others though.