You don’t like happy endings?
To me, it was like sunrise after a dark and stormy night. Puts perspective on everything that’s gone before and tells us that, magic or not, family life and growing up are the ordinary way of things. Wild adventures and dark lords are Not Real Life. Getting married and raising kids together, that’s Real Life.
Harry would not marry, he would become a priest-wizard and vow not to marry. He would be on the fast track to become Headmaster.
I never saw a spark between Hermione and Ron, so I wouldn't pair them in marriage. That's too easy a resolution of what to do with the second and third most important characters, pairing them off. Too easy.
But like I said, I'll grant JKR her artistic integrity and accept the series as written.