The tank cloak proc sounds absolutely, completely, pants-on-head broken in PvP.
I would wear that cloak for the proc even if it gave no stats...
Also all the procs except the caster one scale really well and I will be interested to see how they get nerfed or else people will use them (especially the healer and tank ones) in the next expansion and we all know how much Blizzard hates that kind of creativity.