I will say the last update did a lot to bring Moon Druids in line imho. I haven't used myrmidons though. Full disclosure I restarted as Bard after level 6 cause I was tired of the druid issues.
Atm moon druid is a bit too carried by 1 or 2 forms while all the others are just lackluster to a fault. It's even worse because the best forms aren't even moon druid exclusive. Wolf and Bear are just mid. Spider at will web shot and super jump is absolutely bonkers. Then it's mid again for a while until Owlbear breaks the game again.
The issue with moon druid isn't one of viability, but of enjoyment. Very easy to dominate if you just stick to the best form for a level range. Of what I've played that was spider and then owlbear. But you can get those as land or spore, and the utility aspect of druid suffers greatly because of this.
Personally, I'd like spider and owlbear nerfed, Bear and dire raven heavily buffed, and wolf form moderately buffed. Not sure what to do with Badger as it feels weak but has neat CC potential through burrow which is kinda cool actually.
Also, badger form should be able to dig up buried chests without a shovel!
