I will be honest and just admit I suck at LoL.
Months ago I tried it and was having fun with pratice mode, killing dumb bots and learning the ropes of the game.
Riot, however, made some change now I forget which made bot-games very, very little rewarding and you need XP to buy some stuff like runes to pimp your character.
Multiplayer LoL experience.... was harsh. Too much stuff I didn't knew being thew at me at the same time, and the players expect you to know what to do and play "the right way" whatever this means buying certain items or choosing certain heroes. Failure is not taken lightly on a game which matches take a while and winning gives your rewards.
I decided to went back to TF2 and W+1 my way back to happiness.
Fin.