Sometimes Trolls are awesome...

[Excited Penguin]

I know it's old but don't let that fool you. Except for the fact that Dota2 allows for better graphics and usage of the mechanics of the game and thus for slightly better gameplay, the complexity of the game is exactly the same. It's a ridiculously hard game to master and that's why an insane amount of people upon playing the game for the first time quit trying to understand it and go play LoL or some other game meant more for the general public. Think of it like the holy grail of competitive gaming. You don't really get good at it if you don't intend to put a lot of time and effort into it. Also you have to be extremely strategic by nature. A lot of things go into it at the same time, like teamwork, good reaction-time, thinking on your feet, being good at handling pressure(this one is a must), planning(if you pick the wrong heroes for your team out of a pool of more than a hundred heroes you lost the game before you even started playing), etc.