User blog comment:Hidden Sniper/Mechanics that don't make sense to me - Part 1 Lifesteal/@comment-5211639-20130721195540

That's right that lifesteal looks really scary as it is, but I already tried the retarded tactic of lifesteal stacking, and I was one of many to test this, and I have to simply conclude, like all others, that life steal doesn't come with a reliable DPS : take any AD character in the game, take two players that will both play it in a 1v1, one of the two takes a build with a shit ton of lifesteal, the other one takes a build with a bit of lifesteal and everything else to increase his DPS, with the same amount of health, armor, MR and penetration on both sides, and make them duel : the winner will always be the one with the DPS oriented build, since the full lifesteal build doesn't actually give sufficient damage output to be efficient.

And as I formerly played Dota 2 (I played it a ton of times recently until I eventually got sick of it), you cannot say that lifesteal doesn't come weaponized, it even comes at a big amount with a huge amount of health and also damage. So much lifesteal on a single item is no more possible in LoL.