When you check the trade forums, Kulie is still one of the only Leafs that consistently comes up from other teams' fans.
Not that it's much of a value gauge, but it shows you who they're noticing.
Kulemin is a solid player for this team, and the blame is next to never on his shoulders when the Leafs lose. Outside of unrealistic expectations, of course... (Wait! You mean the Leafs lost because Kulie didn't get 10 goals/game??)
Kulemin is one of the puzzle pieces that is already solved for this team.
I would agree though, that Kulemin is definitely playing more aggressively this year, as compared to last year. He's much stronger on the forecheck and is producing turnovers, something he wasn't as good at last year.
To ever get back to his 30 goal season, he needs to both drive the net and fight for chances there, as well as have the other players around him perform better, such as defensemen getting pucks to the net, or other forwards drawing defensive coverage.
You're only as bad as your weakest link so I wouldn't worry about Kulemin at this point.