I couldn't agree more.
We all watched the first Kingsmen (one of us hadn't seen it yet) before going to the Golden Circle and we were all extremely disappointed in the film.
A 50 something Dad, 40 something Mom, 15 y.o. Son & 13 y.o Daughter each thought the second film had so much potential that was wasted by going in directions that weren't only unnecessary but downright nonsensical.
Yes, the extended cameo helped to salvage a bit of watchability.