I disagree. They did build the walkers up but although they were the most serious threat, they were always the side threat. The predominant focus has always been the throne.
Moreover the show caveated it can all be over from one stab to the NK after Jon managed to take out shit loads of whites after killing their main man. We knew they can be beat this way, so we shouldn't be disappointed that's how it went.
Also we don't have long left. It was always going to go down to one epic showdown between the two sides and we got the battle we wanted. Surprised people can still have issues.
I disagree, the pilot of the series had the White Walkers as the dominant threat. "Winter is Coming" has been the main catchphrase for the entire show, the Show imo has always been about the White Walkers, most of the Seasons have ended with them as the final scene. Given the amount of transporting that happened last season, we'd still have more than enough time, its still 3 feature length films to go.