I've not played moon druid in the full release yet, though I did do a playthrough in EA.
My two biggest problems with the class, much as I enjoyed it, were (a) not being able to activate/move concentration spells like heat metal, call lightning & moonbeam when in wildshape and, (b) the ridicuous ease with which concentration is lost in BG3 which affects all classes but moon druids disproportionately given they are more reliant on concentration spells as they can't cast in wildshape. If just those two things were fixed, along with the bug that means you have to re-equip items after wildshaping to regain their benefits, for me the moon druid would be hugely improved.
By level 5, it was also much in need of some better wildshapes, but not having tried what we get in the full release I'm not yet able to comment on how far that's provided.
Unfortunately, both of those problems still exist. Along with a lot of other issues. Lots of things that should synergize with Moon Druid just don't. Even some Moon Druid specific gear doesn't fully work with Moon Druid.
That said, I can't complain about form access. Owlbear is a massive power spike. I was able to 1v1 a minotaur as an owlbear when I entered the Underdark at level 6 and it wasn't even a close fight. Saber-tooth Tiger is also incredibly strong as you do a lot of damage and can chain knockdowns to keep enemies prone almost permanently.
.... Of course, THAT said Owlbear is available to all druids, so Moon Druid doesn't actually have a meaningfully strong unique form until level 8.
Elemental forms are also quite strong, but they're also kind of a risk since they eat both Wildshape charges and damage is so insanely high (on Tactician, which I play) that enemies will occasionally still slap you out of it in one or two rounds anyway, leaving you naked for the rest of the fight.
