P.K. Subban has been a polarizing players, because he is fun and awesome and great and some people don't like that. However, when he became a restricted free agent this offseason, it became clear that he was in line for some sort of extension. The Canadiens decided he was worth investing in, because they have indeed signed him to a big time extension.
The deal if for eight years and $72 million, which, obviously makes it a nine million a year deal. That gives Subban the third biggest cap hit in the league. On the one hand, at the moment that seems high, but the cap should increase, and then it should be fine. Subban is 25, and he is one of the best defensemen in the league.
Subban scored 10 goals and 43 assists last season, which is very good for a defenseman. He already has a Norris Trophy too, albeit in the lockout shortened season. He's had a real positive impact on shots and possession and such, and perhaps that will improve as he ages a bit. So far, Subban has showed a ton of skill, but he has more promise, and he's also a fan favorite of many, which can't hurt, even if hockey loving Montreal.
It was never really a question that Subban would re-sign with Montreal. Teams don't fire shots at other teams' restricted free agents by and large. However, they could have tried to low ball Subban, or signed him to a shorter deal, but they didn't. Instead, they made him the cornerstone of the team, and rightfully so. This deal was basically the last bit of intrigue in this NHL offseason. Now it's just a matter of waiting for the games to start.