I think if you have really high % life leach, and really slow attack speed, but with really high damage, then %leach beats LOH, you keep factoring in DPS,
but your not factoring in hits per second, just my 2 cents.
also we havent gone into the max life % leach you can get.
Uhh... yeah we are. At least in the posts I made earlier in the thread, hits per second is very much factored in. And max life leach has also been mentioned in the thread.
And yeah with extremely slow attack speed, life leach will of course overtake LoH much faster. I don't really think that's an effective way to play though.
The most simple reason for LoH is that you don't need insane DPS, just a little attackspeed and you can concentrate completely on defensive stats. The better your defensive Stats are the more useful LoH gets. If your a glasscannon who cares that you can heal yourself. I think Blizzard misscalculated Life Leach a little. Remember how attackspeed and some skills where nerfed so certain DPS numbers are not even possible anymore. But don't miscalculate your real DPS, its a lot higher then your weapondamage. So getting out 1000 Life/sec should be doable with life leach and high dps, but LoH can give you a lot more, with certain skills that proc it multiple times and for every opponent.