I found LoL frustrating at first, but I think it's finally growing on me. I can't just pick a random character and 'wing it'. And just like with any competitive video game, I'm mostly put off by the thought of playing with strangers. The other day I was in a bot match, and a random player said he or she would report me for stupidity if I died a lot.
It seems like the only time I can play LoL is in the night when I'm certain I have nothing going on. Because the matches are so long, there's been a few times I've been called away to do something else, or what have you.