Here is something I edited recently. (no nudity in this cut, but still nsfw most places)
Honestly, I think we're at a race to the bottom. With the influx of tube sites, and pay per clip sites, it's become apparent that volume (and more importantly, exploiting underused niches/kinks) trumps quality in terms of making money. It might turn around, but they don't quite make the full length porno films like they used to. I can't say there is really a golden standard, but usually for porn, if you notice the editing in the first place, it was probably done wrong.
Fair enough. I guess quality isn't the first thought when it comes to satisfying base urges. I do wonder though, if any sort of porn snobbery will yet emerge or has already. I know that some sites claim to try to cater to people looking for higher quality in terms of chemistry between actors and whatever, but what I'm imagining is more along the lines of how people consider themselves film buffs and appreciators of obscure directors.