I got lifestealing on one of my alts today and I noticed that it was proccing a whole lot more than it should be, and I noticed it seems to have a 80%+ proc chance on Warrior's Rend (with the possibility of multiple procs per Rend). Lifesteal does 42 damage, and then heals you for 42 making you unstoppable at lower levels! I killed a few things for about 2-3 minutes and the recount for that is below.

If you can't see the recount, it says:
Code:
Rend: Hits - 80
Lifesteal: Hits -80
Damaging attacks:
Melee - 39.5%
Rend (DoT) - 30.6%
Lifesteal - 28.3%
Pretty sure this is not working correctly, and might have something to do with the way they re-did Rend, making it do instant damage and still be considered as a Damage Over Time.
Have fun. :]