Originally Posted by
Raugnaut
Theres a brewmaster tanking guide, you know. It lists Expertise as being the most valuable stat. Generally, he should gem Expertise in red sockets, Hit in blue sockets, and either a green/orange gem in yellow sockets that have either hit or expertise plus some yellow stat (The yellow changes depending on what you want to go for, crit, haste, dodge, or mastery)
However, he should be hitting both the Hit cap and, at the very least, expertise soft cap (7.5% in both). After that, expertise is still better, the question is more what he is missing to get that cap. He should hit all the socket bonuses, and pick a secondary stat that he can keep, and then reforge away from that. (I.E If he has multiple pieces with haste/mastery, he picks either the haste OR the mastery, and reforges away from that stat on all pieces)