If you ask me, I think [i]Spec Ops: The Line[/i] by far the most underrated game. A psychological horror game about the horrors of war and deconstruction of the modern shooter genre disguised as a generic, run-of-the-mill third person shooter. Brilliant writing, excellent visuals, amazing voice acting. Also all the tiny details you only notice after completing the game and playing through it the second time, subtle hints to Walker's growing insanity. The game is basically just one big middle finger to popular shooters such as CoD in which the elite special forces soldier protagonist goes to some Middle Eastern country and shoots a bunch of terrorists and saves the day, showing what would really happen if you try to be a hero: you can't. You basically fuck up the city you were trying to save and pretty much doom its inhabitants to slow, agonising deaths by dehydration. 

You spend a majority of the game fighting American soldiers and not generic Middle Eastern terrorists. The totally evil bad guy who's been taunting you over the radio and trying to kill you isn't even doing any of those things, because he's dead. He killed himself before Walker and his teammates even arrived in Dubai, and the Konrad we see in the game is simply a result of Walker's insane hallucinations, since he needed someone to blame for his own actions. Nobody saw the plot twist coming unless you paid [i]very[/i] close attention to the surrounding environment and take note of the subtle hints.

Overall, the game not only criticises Walker for trying to be a hero, but the player as well, that trying to be a hero has only caused more   death and destruction than before. So,

[i]Do you feel like a hero yet?[/i]

Overrated would probably be [i]Undertale [/i]or [i]Doki Doki Literature Club[/i], because come on, I'm sure you all know why.