A few differeneces though. Unlike DotA pretty much ALL damage is burst damage. It's rare you're in a low amount of HP for a long amount of time, unlike DotA where attacks do a lot of damage. Also, it's OP in a 2vs1 situation where you can take one down, then swap HP with the other person. In a one vs one, you're forced not to attack them if you want to use the spell effectively. Also if you just disable them just before they're low...then they can't do anything. Unlike DotA there is no BKB to stop that....