That finale goes against everything the show has been about
I think we all remember Ramsay's famous line "If you think this has a happy ending, you haven't been paying attention". The show has always been about anyone could die at any moment, every character you love could die, theres very rarely happy feel good moments, this a cruel world where your hero doesn't always win.
Its like this all throughout the show, then in the finale its all sunshine and rainbows, everyone's story gets a happy little ending with a bow. Kings Landing is now ruled by the happiest friendly people in all of the land, Arya sails off on a boat into the sun, Bran is King, Jon goes back to his free folk to live among the Wildlings.
I dunno i guess its a good ending for those who just wanted everyone to get a happy ending and a rap up for their story. But as fan of the show since the beginning, this ending just felt like a completely different show, this isn't how i ever pictured this show ending in a million years.