I have been playing league on a off for more than 5 years now and imo isn't really as terrible as basically every review here will tell you, as long as you can find a group of buddies to play with and don't take the competitive scene too seriously it can be a pretty fun and sometimes even rewarding game.
I'd say that the worst thing about it is how high the barrier to entry has gotten, despite riot trying to present it as newcomer friendly to attract new players you basically won't really know what you're doing unless you either have an experience friend to coach you or spend a copious amount of time watching streams and videos to try and learn it. Its the kind of game where you are probably going to spend a good 100 hours to fully understand how to use a few characters and the general flow of the game.