Defense of the Ancients 2 has come a long way since it originated from a user-generated custom game from Warcraft 3 and its expansion. Since then, of course, Valve purchased it to make DotA 2, and the rest is history.
Balance patches never stopped, punctuated by periodic overhaul updates, drastically changing the paradigm of the game each time. This has helped the game get some positive attention from the public.
To put into perspective, their yearly grand stage tournament called International, began in 2011. It was hot news at the time because it was the first game to have prize pool over 1 million dollars. Fast forward 8 years and this year's International prize pool was whopping 34 million dollars! Just who knows how big it will be next year?
The insane learning curve has put off many players over the years, but it's not too late to start now. It will be difficult, but it will be worth it on the basis that DotA 2 indeed is one of the hardest game in the world. It's exciting to be apart of something like that.
There are over 400 spells to know, 100s of items to consider and various mechanics to master. It won't happen overnight. Nonetheless, it can be done, one match at a time.