Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
My post won't change anything anyway but I believe the tiers aren't set up right at all. Tier B should be splitted in at least 2 tiers. I would propose move half of tier B to C, move C to D and Metagross to E. I mean I can't take a tiering system serious that places really really good OU pokemon...