The first few seasons of this show where really good.
It took the concept of a regular detective TV Show but with the twist of an interesting character who used observation and psychology to solve cases. What is more, it had an interesting main plot surrounding "Red John", the enigmatic killer who murdered the daughter and wife of the main character.
But, sadly, we are already 5 seasons into the show and the whole main plot is starting to get tedious and monotonous rather than interesting. The show follows a very generic formula a few times each season of introducing a new character that has clear information about Red John only to later somehow kill him (either by one of the main characters or by Red John himself) before he can tell the audience any new or relevant information. The same trick has been used in several mid seasons and full season finales, and personally I'm starting to loose interest in the whole story.
I tend to watch several "detective", "investigation" shows such as criminal minds, castle, white collar, etc. The way the writers of those shows keep it interesting is by introducing a new main story ever 1-2 seasons. Sadly, the people making the Mentalist seem to be so afraid of finishing (or advancing) the main plot that it is starting to feel really stretched out
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