Best/Worst nest you've ever saw?

Best nests are usually away from my district. Those would be Scyther and Rhyhorn nests (found my 100% Rhydon in the Rhyhorn nest). Best I've had nearby was the Aron nest.
Worst would be Drowzee nest or Natu nest.

Based on who's asking i'll guess the proper answer is something like "Nests are stupid and this game is stupid and Niantic is stupid and i don't know why i keep playing this stupid game rabblerabblemerpmerp"

I don't know which of these would be best, 'cause they're all awesome and usable: Charmander, Cyndaquil, Torchic, Magmar, Omanyte, Misdreavus, Houndour, Shroomish and Aron.

The worst I've ever seen has to be Sentret nest. And honorable mentions go to Venonat and Wobbuffet.

I did stumble on a Torchic nest but it only had 2 days left on it. I've also found Charmander, Onix (found a 100%!), Omanyte, and Totodile nests. The rarest nest I've found was Girafarig.

Worst is Yanma

Both are different botanical gardens in the area with very high spawns
Best: machop
Worst: either Venonat or Bellsprout

I suppose venonat is the worst since high level Victreebel can sometimes be useful (though it was during an event so it was very dissappointing).

what makes a Corpish Nest great and a Poliwag nest terrible?

they seem about the same to me.

Best: Huge Machop nest on campus (twice in 6 migrations). At that time I still could use the candy, but nowadays I would be indifferent about it.
Worst: Dunsparce, Girafarig, or Wobbuffet (former two at that huge campus nest, latter at my home)

A Shuckle nest was both the best and the worst.

My best nest has to be the Geodude nest that was 1km from my house the first nest change after raids started and there was going to be 4 flying legendaries in a row. Then it switched to Gastly and back to Geodude. That was good timing for a meta change.

But then there was that Machop nest that I farmed for 1800 candy and filled out a full team of 6 level 40 Machamps to rip through gyms and Tyranitar raids.

No reason to worry about bad nests. Just avoid them. Or if it's like the nest near my house I go by/visit everyday anyway, collect the stardust.

Worst nest was easily a Shuckle. I can't really classify anything that evolves (either now or in a later gen) as a bad nest, just not a great one. Even if the final form isn't worth anything either, it's still an XP source.

Best nest, probably a Machop one, though I've fortunately seen a few these over time.

Most memorable was a definitely a Bulbasaur one, around September 2016. They're very rare in my local area and hardly anyone had a Venusaur, or even an Ivysaur for that matter, then they appeared in one of the major parks in town and everyone went crazy.

Quillfish nest was pretty shit

best: eggy within reach of my house

worst: probably murkrow

Worst was ekans, twice in 3 migrations.
Best was duskull, but only because I caught a shiny.

Best: Abra, Eevee and Omanyte
Worst: Natu

Worst: Snubull, and Luvdisk (right after the 2018 valentines event).

Best: Dratini (at the very beginning of the game they did nest, there was one right in my campus. I was unaware of how common they were at the time and didn’t exploit it when I had the chance.)

Worst nest was a Scyther nest where I spent an hour and only saw one. Best would be the current Magikarp nest at a park close to my house. I caught 50 Magikarp in two hours, including two shinies.

Best: Machop nest last summer near my home. Farmed a few hundred candies over the two weeks, compared to previously having been able to evolve exactly one Machamp. Still took until raids to get one with double fighting though.

Worst: Any Dunsparce nest ever. I've seen several.

Also Poliwag is far from the worst nest possible, it's easy to catch and evolves for 25 candy.

Best : Girafarig (that one saved my pokedex, because Girafarig is not that easy to find/hatch)
Worst: back to back Zigzagoon nest

Onix nest was awesome.