I don't like humanized ponies.
I especially like the HiE fics that have a science fiction edge.
On a side note, I hate
The Conversion Bureau and most of its spinoffs with a passion. The only TCB fics I like are the ones where Humanity shows the ponies the error of their ways (either by opening up a giant can of whoopass or by less violent means) or ones that completely deconstruct the whole premise.
As for why I hate these fics:
1.) Designated Hero and Designated Villain seem to be the two most commonly used tropes.
2.) A lot of authors use it to espouse their "Humans are Bastards" view.
3.) Some of the authors are f---ing crazy.
4.) The ponies are turned into a race of xenophobic Mary Sues.
5.) The stories can get really heavy-handed with their moralizing.