There wasn't a whole lot that bothered me in My Little Pony Friendship is Magic, although I do wished the characterization of Queen Chrysalis in the show was more edgy like her comic counterpart.
One thing I do hate though is how Last Roundup episode got obliterated because of a culture war, DH is one of my favourite background characters by the way, she is cute, funny and her happy go lucky behaviour makes her all the more loveable, especially Rainbow Dash's interaction with her, also it is one of the times where RD was shown at her best. And that's another reason I wished I could leave this planet someday for a better one, but Equestria does not exist, it is what it is, I ain't getting my wish, so I am stuck on this broken planet where people force opinions on each other, until the day I die.