Far from it.
If someone seriously thinks that Final Fantasy 13 is one of the worst game EVER made then they have not played a whole lot of games. I wouldn't even take it seriously if someone said that because it sounds more like someone either exaggerating out of frustration of the game or they're just trolling around looking to bait someone into getting angry.
I actually enjoyed Final Fantasy 13. I never really fully understood what was going on but from the little I have played of it the gameplay was fun and I LOVED the music.