You really don't think it has anything to do with the numerous serious technical deficiencies it suffers from? (Read some of the other comments for this submission if you really do need more details about these problems.)
When it comes to databases, fooling around just isn't an option. If a given database technology has flaws, then those flaws need to be widely known. And this isn't done to be "cool". This is done because the safety and integrity of data are of the utmost importance when working with database systems, and it's absolutely critical to know about anything that may cause problems.