Can't believe I'm about to defend Leyland, but here goes. Yes, he is not the best in-game manager, but there is a lot more to managing than that. He runs a great clubhouse, and knows how to manage the long 162-game season.
He does not overuse his pitchers (like he did in Pitt). He is not overusing Verlander. In fact, pitchers are way too babied today. 120 pitches is not that much. 130 isn't even excessive, if you throw with good mechanics. And Verlander has impeccable mechanics, which is why he's never been on the DL.
Overall, he and Jeff Jones have handled the pitching staff quite well - it's the strength of the team. Now hitting is another story - I don't like McClendon at all - I think he needs to go, but Leyland is too loyal, which is great up to a point.
And to say that Cabrera and Fielder should not be hitting 3-4 because they are both slow is insane. Those two hitting 3-4 are one of the main reasons we won the Central this year - they both produced big time. And it helps that they are righty-lefty. Of course they are slow - nothing Leyland can do about that. If you don't think the Tigers should have slow players, blame Dave Dombrowski, not Leyland.
Overall, I think Leyland is a B manager. He's not the A manager that some make him out to be. But he is certainly not a C-D manager that you portray him. With the lack of available options out there, I am fine with Leyland managing another year. We could do much worse.