I'm... I'll check it out. I've been reforging mostly for mastery. Neither would really help with magic though right? I know I should be better at interrupts, but that is last thing on my mind at the beginning of a larger pull. (unless I'm pulling a caster away from CC's) I've been using a bear guide thread at MMO for stats and stuff btw.
Mastery isn't bad.... but Dodge is much better.. that's what you should be reforging to.
Also, when I mark cc, I tend to focus on getting spell-casters dead first so I can be focusing on them with my interrupts and stuns on them since my mitigation just isn't that effective against them and the remaining damage is incoming from the more physical attackers.