When I set out to try a new moba I play around and try all the characters (or at least the meta ones), which is like the first 25 games. Then I focus on one that I like and try to get good with that one so that I have at least a one trick pony. At that point you can start to slot in other characters situationally. Problem is that that's 100s of games just to learn how to play, much less to become a little competitive. The lower levels of competition are not necessarily people that are bad mechanically, they just don't understand the game. It reminds me of WoW in that the people at the top levels of the game are the most unemployed.