I'll speak on behalf of those who hate the ending. Yes I do hate the ending because it was unrealistic (Albus Severus??? Please!), had no-where near enough information, and didn't show no love for most of those who died (Lupin, Sirius, Fred etc etc etc.) I could go on...
I did want Harry to have his happy endin but I wanted a decent, realistic bit of writing to finish my favourite series of all time. Not a load of mush that was probably written at the same time as PS/SS and did not fit in with J.K's style of work that has developed over the years. I mean we got over the deaths of major characters. We coulda handled more than that!