As a neutral who plays both depending on which friend plays what, the Dota 2 community is much more actively hostile towards League than the other way round but both are as equally aggressive within themselves. Comparing the games themselves is apples and oranges, both play very differently and have emphasis in different things. Your thoughts are great keep it up.
Super duper excited right now, Riot posted an FAQ the key point of which, for me, was that they intend for this to be just as intensive on your PC as League currently is, which seems almost too good to be true. Regardless I'm as keen as a bean.