But these don't make her a troll or a bad person. She's an Alicorn and has lived much longer than anyone else we've seen so far in the show (aside from dragons) and with age often comes wisdom. We haven't seen evidence that she's a poor ruler, quite the opposite. From what we've seen of Equestria the country seems to be in fairly good shape. Not a lot of crime outside of trickster unicorns making big claims. The economy seems to be in pretty good shape too.
I will admit that there are times that P.C. seems to enjoy messing witth folks, but not out of a desire to hurt feelings or make anyone mad but rather more a desire to help ponies loosen up and relax. Trollish behavior is often messing with folks to anger or annoy but P.C.'s way makes me think of a grown up Pinkie Pie. Play a few pranks and tricks to get ponies to enjoy themselves.