It may be due to the length of time we've played the game but I for sure feel the same. Back in season 4 I made it to diamond off of just stomping solo lane and using that to carry. Now it feels like no matter how well I do if 2 other players on my team perform poorly it's impossible for me to win. I'm well aware there's a lot I can work on but I don't feel like my individual skill is being represented in ranked anymore.
Also nothing is entertaining or inspiring anymore. I've seen pretty much everything every champion can do so nothing impresses me anymore. At best it's like "oh hey look that person is kind of decent at their champ." There's no more "WOW HE'S SO GOOD!". Each champ is limited to so much and is only strong at about 1 thing on average and it seems to be overshadowed. Not to mention meta-picks being far superior to non-meta-picks. Riot cares more about $$$ than they do about game enjoyment I think. They care more about shitting out new champs super often rather than trying to further balance already-existing champions. I understand full balance is impossible to achieve, especially in League, but seriously you get them as close to balanced as you can. There's so much that can be done to make this game exciting, competitive, and closer to balanced but they focus more on extra revenue. I understand the revenue thing a bit since it's free to play but I don't think you'll lose out on much when you're making the game exciting for players.