[SmG Conan]

Rapier is a game changer never lose it. Don't forget the Gem of True Sight. You'll also lose this when you die.
In DotA if the other team is owning then you'll have about 5% - no chance of turning the game around. If the other team reach their max level, their is a high chance that the losing team may not be even around level 16. Also, if the other team has maxed their items then the losing team may get stuck in their basic boots.
The Guardian Angel revival is considered OP in DotA. If there was an item like it everyone would buy it. There is only one hero that can revive with his ulti but it has huge cooldown time and consumes a lot of mana. The only other way to revive a hero is to get the Aegis by killing Roshan and he gets stronger as time passes.

One thing I hate about LoL is that they even categorize Champions by lane, this hero top, this goes bottom.

Teamwork matters a lot, hero aura effects can do so much. And some hero combinations hurt own team.
LoL is very casual compared to DotA. Say like COD and Quake :D
I personally prefer DotA, its the game and nothing but it.

Didn't know you where a hardocre DotA player. My cousin is so good at DotA, but he doesn't play it anymore :/ He used Garena to play DotA