i must say that Dota made a good job balancing them as much as he did.
*Cough* Critical Strike, Vamp Aura, Reinc, Storm Bolt on one hero IS balanced? If you take a look on the computer shop's sign where I play, you'll see a Rogueknight with 123+ base damage + 738 bonus damage. SOME heroes are balanced, the items are not. VoD2 better than DotA, but will never be more popular than DotA. But if you put more work into it, it might be the next ToB?