io9 quotes from an interview with author Lev Grossman who says:

I loved Harry Potter, but that epilogue was such an astounding failure of imagination on Rowling’s part! And in a way, it throws the entirety of all seven novels into doubt retroactively.

I felt the problem she failed to solve was the question of, “here’s a young man who can do magic, who has defeated the enemy of humanity when her [sic] was 18 – what’s the rest of his life look like?” And the best she can imagine is that he marries his high school sweetheart and puts on a big gut and lives in the suburbs. What a disaster!

Graeme McMillan at io9 believe this is going to cause some unhappiness in Potter fans but I agree with him. You could argue that after the early life Harry has all he wants is a ‘normal’ life and an auror is a fairly prestigious job, but as someone who was a shoe in for Minister of Magic you’d have to class it as underachieving.