Planning
Planning more than 3 days ahead is the most overrated thing ever. Seriously, when someone decides to become lets say a cop when they are 5 i can't help but to think "fucking idiot".

Star Trek.
Star Trek is probably the most overrated shit you can find.

Potatoe Chips
This shit really sucks, they don't even taste good. What are you eating them for?

The Music Industry
They pump out as much bullshit as they can and people blame downloading for the high prices and low sales. Get a grip.

Alot of other stupid shit
There are so much overrated things out there that it would take a life time to write them all down.

The word overrated however is very underrated in my opinion, i use it all the time.