I really think HP items are the root of most of the evil. When you have utility spells to keep yourself alive, having a lot of health is a much bigger bonus then it would be for someone who just had health.
Plus, how is it fun when an Oak has 2900 health at lvl 1? Abilities do so little damage at that point that it's just...not fun.
Then when abilities catch up at lvl 7, he has 4,800.
I'll tell you, with less hps the game is a lot more fun. Creeps matter that much more.
Edit: Hit submit too quick, lol.
Plus when hp items are that good, then wtf is the point of any other items? Mana helms yeah, but thats close to it. I changed multiple other items and its working out great so far.
For example: I changed the gauntlets of dispair to a 25% chance for 350 mana. It's fun to pick that over Unbreakables. It's a fun new way to get manaz and has me microing my ass off against creeps (so I dont waste shots that don't make it before he dies).