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The reason it's the most popular MoBA is because for most of it's life, it was the only one that was completely F2P, on top of being well marketed. It got the larger audience early, which got more people interested in it, they got their friends into it, and it keeps going like that. I know maybe 2 or 3 people who play DotA 2 and Smite, and only one other that plays HoN, compared to the 20+ who play LoL. And honestly, if we were just going by the characters, LoL would be my last choice. LoL has nothing on Meepo, Rubick, Invoker, Broodmother, Morphling, and so many other heroes from DotA.
I played DotA2 for a bit and couldn't settle on a character I actually liked through and through. While I haven't played them all, all of the ones I have played had boring as hell personalities and annoying as hell voice acting.
I love nearly all of League's characters and their voice acting(except Cho Gath)