You know, I'll just download and check out League. Easier to have an informed opinion if I did as opposed to dismissing it for not being the first moba I got into. Hell, I remember thinking Dota 2 looked really boring at a Dreamhack once. And now I am more into it than I ever was into Starcraft 2.
And I think that's sort of the case for a lot of people, Dota 2 just came out at the right time in the right way. Dota 2 came out when I figured I would give mobas a try and I think it amassed a certain hype and people wanted to be part of that zeitgeist. At the time League was already established and had it's audience and for me personally I am not even sure it had a Mac client at the time.
hat being said I don't play either and think they are mediocre games with only a fraction of the skill ceiling that a truly competitive game like StarCraft 2 has.
I don't think that's the case. On a fundamental level the strengths you need as a player on either side of your preference is two completely different types of competitions. One is a one vs one game and the other is a team vs team game.
If you figured out DOTA already, you should be able to pick up league with little trouble. If you want to just try out the characters, play against bots or play in the ARAM mode. It's just a single lane , 5v5. Good for getting used to combat etc.