I'm the opposite, I like Dota 2 a lot better than League. I will only play League if I have a stack of like 4 or 5.
The thing about playing worse your first time definitely happens to everyone. I was pretty bad when I started but after a while you learn the more advanced mechanics and you can start doing pretty well.
My favorite heroes are Bounty Hunter, Windrunner, and Puck. Nature's Prophet is fun too. But I'm also practicing with more solo offlane heroes like Beastmaster, Dark Seer, etc.
Drow Ranger is honestly pretty overpowered right now, she got too much buff in one of the last patches and her aura is just ridiculous now. But its easy to win games as her and she's pretty simple so she's a good starting point.
Anyway, if anyway ever wants to play some matches, or if anyone needs an invite (I got 6 more.) feel free to add me on steam.
http://steamcommunity.com/id/misora