User blog comment:Gerokrat/Suggestions for Life Steal/@comment-6295292-20130926172248

health regen I think is somewhat fine since unlike lifesteal it's a passive thing you don't need to do anything to activate health regen it may be a little slow but that is the trade off  you don't need to get yourself in danger to get health regen while life steal is more involved you have to go get into possible danger to use it, when you attack creeps to get lifesteal you can be poked and have less health than when you started with, you can be stopped from doing any lifesteal to an enemy by them staying far away and pokeing or they can CC you and you can't auto attack for some time and it can also be reduced as said earlier by others from armor and grievous wounds life steal is fine right now IMO and many others.