So I did a raid in BT tonight as TG specced cuz we never run with any druids and I figured I should give the raid that 5% crit and I must say I was very impressed with the dmg meters and dps charts posting after every boss, I always come up on the top 3(except for supremus cuz he one shot me early) and found TG not to be that bad as long as you stand BEHIND the mob you're hitting. All those chances of him to parry/block really show up with TG but behind him you really wont have any problem (although you should of known this already when meleeing on mobs). Just my two cents I tried arms and loved it and TG and enjoyed it much just make sure you got that hit to go with it.
Fulgon