taken from shattered hand forums:World of Warcraft - English (NA) Forums -> @ lvl 80 tanks (raiding)
this is from Dranlo, MT for Relentless (18th guild in the US)
andAP is good, but strength is better. My current armor is about 25k, (I took the values from the end of our Naxx run last night) and with that talent I'd have 406 AP for 3 points.
Consider with a feral druid (enhanced bleed effects), and deep wounds my deep wounds tick for 300 - 400 after if not slightly more, Also, you may have noticed I'm using a slow weapon, high dps/damage range, in the past we were forced to use fast weapons. Devastates, heroic strikes, etc. are amazing with it. I was ripping 4.5k - 6k tps last night. So, yeah, I'll take deep wounds over armored to the teeth any day.
Deep wounds was retuned, back in the day, a new "crit" would over-write an old one. So if you had deep wounds ticking for 100 previously, next crit, regardless of if it was better or worse than your current deep wounds tick it'd replace it. They changed it so it's not so static. Deep wounds uses your weapon damage, so higher damage ranges/dps will make a difference for sure. So, I'll take an example from last night, my first crit deep wounds started out at 81, then it shot up to about 200 or so, and topped off at 340 or so. I don't know the exact mechanics (was too focused on getting to 80) it doesn't overwrite your deep wounds anymore. They stack, think of the old ignite mechanic for mages (if you played then) but you can keep it stacking until it completely falls off, or you hit the cap. I want to say it will only add to your number after 3 or 4 crits and then it lets that deep wounds fall off before refreshing. It's pretty hand, moderate dps = tps. Hope this helped a bit, I'll try to respond when I do more homework on it!