Sorry but that's just 100% wrong..
I never read up on the wiki's or anything at all when I first started or before that, I just gave it a wizz. Before that I never even enjoyed Dota itself, I couldn't stand to play dota for more than 5 minutes but LoL just clicked with me.
The download is quite small so give it a try, starting out you will more than likely run into your fair share of leavers/afkers/ragers and douche bags, it does however get better later on down the track when people take the game more seriously
EDIT: On another note, it's much more friendly to the casual players than it's major counterparts if that's how you'd like to play





