Yeah, Arondir seems to be the best pitched and elfiest elf. Galadriel - yes, I can see what they're doing and I don't necessarily disagree with the arc I think they're going for, but they've over-egged it a bit. I think it would actually work better if a) more people knew who Galadriel was and b) they actually had her doing more magic? Like, if she is more obviously a power level separate from the people around her then her frustrated "why aren't these people doing what I want, I'm right" would work better I think, especially if the Numenoreans weren't reacting to her as "just some elf" but "this person has walked out of a history book, what in the world is going on here".
I quite liked the Harfoots, but that's partly really liking the totally-not-Gandalf and how he's played.
Harbrand could be Annatar, but also I think having him being that demi-heroic human who ends up on a bad arc and becoming a ringwraith would be a pretty good plot arc to have.
My inevitable gripes about the dwarves: I think they've made them too rough round the edges for a dwarf kingdom at the height of its power. The wide shots of Khazad-Dum are nice, but everything is very grey and functional. More wall carvings, murals, crystal pillars and objects, coloured walls and furnishings, and a lot more shiny would be nice (I'm reminded of the "a king he was on carven throne, with many pillared halls of stone, with golden roof and silver floor and runes of power upon the door" line in Gimli's song about Moria - and then the dwarf king has a rather disappointingly functional stone seat and an iron crown that honestly looks like any human smith could've made it). Or to put it another way, we often get told about dwarf craftsmanship but we really don't get to see much of the dwarves' sense of beauty or dignity, and instead they're all made out to by angry grumpy little earthy boys.
The rock breaking scene kind of annoyed me for the same reason. I think it would actually have been much more interesting if they'd made that challenge like a harping contest or something instead: it would've better shown Khazad-Dum as a place of music and art rather than just as a really big mine working, and Durin as a prince and someone who wasn't just Elrond's Angry Buddy Who Digs Holes Sometimes.
(Also why does Khazad-dum have a gate you couldn't fit a handcart through, that's just impractical even for dwarves).