As far as why people like LoL, I can tell you that I think that DotA and HoN are two of the worst games ever made, and Demigod's not far behind. It was only out of a desire to be thorough and on top of the state of gaming because I want to develop games for a living that I even tried LoL in the first place, expecting it to be utter garbage. I was hooked in 15 minutes. So for my part, I like LoL because it's the only decently-constructed example of the entire genre ever made, as far as I'm concerned.
I wasn't really going to respond to Bisjac because I don't think he's trolling but his complaints are equally applicable to any game in the world. You can argue that there's only one game mode in ladder Starcraft 2 or that in Modern Warfare 2 all you do is run around killing people all the time, and it's really more about not being interested in the game. And his post is inflammatory not because he's ignorant and doesn't care enough to learn more, but because he seems to think that not wanting to learn more is the same as there not being anything to learn.
As far as every strategy being the same and the game not being designed to let you do something new and unique, you're in good company with actual LoL players, because you fell into the same misconception that makes people rage at me almost every day. From my first post on the game ever on these forums:
The best part of the game is the deep strategy.
The worst part of the game is that most of its players are ignorant of the strategy and will be mad if you play any way other than "their way" because honestly, why would you play a TRIANGLE in TIC TAC TOE omg you IDIOT.
Well, no, this is not so simple a game, you just don't get it.
One of my goals with the show is to dispel a lot of the myths about how simplistic this game is, because if you have good strategies A and B used by players X and Y, then when X and Y meet each other in a game they will rage at each other because they are convinced the game doesn't have enough strategy to support two strategies that are that different. That causes a good amount of the rage.