You mean all the "good" people who were left, right? The point being, they killed off 3/4's of the "good guys" in the course of the series, and made another mostly good character into a villain before killing her off at the end. And John, noblest of them all, is at least temporarily banished to the frozen wastes. The point being, I don't mind the happy ending for most of the remaining good characters. We've kind of earned it at this point. You can't look at a show that was so determined to demoralize and piss off its audience right up until the end and accuse it of caving to the cliched happy ending.
Given that the internet is in a uproar of people crapping all over GoT principally because John or Dany or both didn't get be the monarch, hearing criticism that this was too happy of an ending suggests to me that there was no way to end this which would be satisfying to a majority of viewers.