The Mentalist is the highest rated show in the world and had held this title for quite a while.
Fans tend to be more critical on message boards, myself included.
But this show is great. We all love it no matter how much they piss us off. Shows take you on a emotional roller-coaster tugging at each string of the heart.
Sometimes you gotta enjoy the slow periods because they lead to greatness in the end. I have never met a mentalist season finale that i hadn't liked.

Check this out: http://theinterrobang.com/2014/01/the-mentalist-tops-worldwide-tv-ratings/