If you're going to get on the "MongoDB was overhyped" bandwagon, you should probably not post links to performance comparisons you pulled off of an EDB Postgres website.
At least EDB used an inspectable and reproducable test. I think posting links to performance comparisons is fine when the performance comparison can be independently verified.
I suggest then that you get the latest versions of MongoDB and PostgreSQL and run that test and report back. Verifiable isn't the same as verified.
look at this article on why that benchmark was bullshit.