While Tanev is no longer the defensive rock he once was, I wouldn't say he had a "really bad year." He is still a very dependable #4, although he is in his 30s, has a very long list of past injuries, and plays a very punishing (on the receiving end) style. It is very risky to give him more than 2 years. Of course he'll get more, but the team signing him to term will be sweating bullets for pretty much the whole duration. The guy is a warrior though, he'll try to play through as much as humanly possible.