The fact he's been able to hold down a roster spot on some very good, cup contending teams 4th lines should indicate he's been a quality 4th liner throughout his career. Hell, he was literally one just last year on the Wild scoring at a 20 point pace with them.
Of course, he comes to Toronto and all of a sudden he's washed up and can't play anymore. If this was an isolated incident you could Keefe the benefit of the doubt, but it's not. There's a clear pattern of these gritty, sandpaper players not playing well under Keefe and I'm sorry, it just stinks of a coach who can't get the most out of his players.