Well... last year, we had Garrison, Hamhuis, and Bieksa with better +/- and they were facing much tougher opponents instead of 3rd and 4th liners.
Tanev is an OK 3rd pairing defenceman... but he doesn't contribute offensively and has does not play a physical game. He is worth $900k-$1.2 million considering what comparable players like him are getting.
My statement was that he is going nowhere because he is not good enough for someone to offer sheet. If someone was dumb enough to offer him $1.68 million or higher I would happily save the cap space and take a 2nd round pick as compensation, then sign one of the couple dozen experienced NHL defencemen still out there looking for work who are available for significantly cheaper.