IMO, IOS 11 is one of the best releases in a long time, even though some are complaining about this and that. I'm on 11.1 now on my 6s and aside from some interface issues it's very stable (for me). No one is stopping anyone from complaining, however there are different takes on how one perceives this stuff.
It's your opinion and you are entitled to it, the same as everyone else is entitled to their own opinion. My two 5s are running great on ios 11.1, so I don't see them crippling a four year old phone. 6s+, 7 and 7+ are running pretty well on 11.0.1 aside from some annoying interface glitches that I'm sure will be ironed shortly.
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You slog through crap with your devices for whatever reason. My phones are running well and I wouldn't downgrade to ios 10, even if it were possible.