When something or someone becomes too popular than others, and is given more credits than it deserves to be.

When something gets more appreciation than it actually is worthy of.

A term used to describe something that gets more hype and credit than it's actually worth.

So due to personal opinion and anyone who hates anything that's well known, No matter how brilliant something is, if it gets a lot of media attention then there's always someone who will think it's overrated.

An excuse that people make because they don't like something as much as someone else, and they hate how much other people like it.

Anything that is given too much credit and hype.

A word which recently has been used liberally as a way of discrediting something without having to give a proper justification, most often when someone finds they have a disliking for a popular phenomenom and is resentful of those who embrace it. Often used by anti-trendies.

1) Not as good as people think it is.
2) Not as good as it seems to be.