So I'm going to try and do this off the dome rather than spittin' written, I figure if I can recall something without having to go back and actually look at it that means it impacted me enough to want it.
Starting with the Barbarian the Zealot comes to mind in an instant. I loved everything about it and the idea of playing a Scourge Aasimar Zealot... my giblets are all a'tingle. The Storm Herald was quite nice too, like the Totem Barbarians we started with I rather like primal paths that feel... primal, and the Storm Herald does that.
For the Bard? All of these are a bit fuzzy, but the College of Blades come to mind first. It managed to add some nice combat abilities to the class without feeling like it was stepping on the Valor Bards toes. Glamour and Shadows seemed alright too, but I can't recall them vividly enough at the moment.
Cleric: Forge. Forge. Forge. Did I mention Forge? I liked everything about this domain. If it's the only one we saw published I'd still be happy as a pig in... whatever it is they wallow in. The Grave domain wasn't half bad either, it gave us a slightly less sinister Death domain, though truth be told I let my players play Death Clerics anyway.
What's next? Druids? It's early, I've only had one coffee, and I'm shooting from the hip. I liked the Twilight Druid and the Shepard. I felt they could both use more polish. In particular, assuming I recall correctly, the Twilight Druid got a pool of necrotic damage dice, I'd have liked to see an ability to help reduce necrotic resistance to go along with that, mostly so that it was useful against undead.
Erm, fighter? I kinda liked the Samurai and the Knight. The Monster Hunter comes to mind as well. The biggest issue I suppose I had with some of the new Fighter archetypes was that some of them leaned a little too much on superiority dice. Look, I like the Champion and the Battlemaster and even the EK... but I don't need to see new archetypes taking their toys, most of all the superiority dice since they went back to that well a few too many times.
For the Monk I was partial to the Drunken Master, but I think it's more the idea of having one at all and not so much the one we got, it felt a bit bland. The revised Kensai was alright too though still needed a little more elbow grease put into fixing it up. I think my biggest issues with the new Monks was how much I liked the ones we got in the PHB, the Open Hand and the Shadow in particular. Oh, and as for the Tranquility Monk, I'm actually one of those folks who doesn't mind "pacifist" archetypes... mostly because I don't consider them pacifists. Having mechanics, and so by extension characters, who don't believe in a "violence first" approach to problems doesn't mean these are characters who won't actually use force, and kill, when needed. I think people jump on the pacifist train a little too quickly.
Anyway Paladins are next I think. I liked the Redemption Paladin quite a bit and won't rehash what I literally just said about how I feel most folks really misinterpret the whole pacifist angle. The... uh... Conquest Paladin? I think that's what it was called. I liked it. I like the idea of less than shiny Paladin and while I understand we have that in the Vengeance Paladin there's a nice feel to the Conquest one as well.
Rangers. I like everything we saw in the Revised Ranger. The newer Beastmaster works better and I love the Deep Stalker. If I were making a character to play tomorrow it'd be a Deep Stalker built on the Revised chassis. I was also partial to the Horizon Walker and... Primal Protector? The one that turned into a big treant type, that was really cool, had a Warden feel to it.
As for Rogues, the Scout and the Inquisitive were pretty good. That said I can't recall enough of the features to comment too much on them. So short and sweet for the rogue.
Sorcerers... I loved the Shadow and Sea bloodlines. Phoenix and Stone were alright too, but if push comes to shove I'd rather see the former two and not the latter. Favoured Soul I could take or leave, I liked them in previous editions, but this time around I'm not especially interested. What I wish we would have seen is a generic "arcane" bloodline, one who's features maybe double-down on sorcery points and meta-magic... maybe expand the spell list a bit too, and offer people a sorcerer that isn't actually tied to anything more specific than "I have magic in my blood."
All we have left now are Warlocks and Wizards right? Let's do them together, this is getting long, my brain is only half working and I've been typing all of this on a phone... I liked the Shadow Warlock, the Raven Queen one wasn't half bad either. In fact I kind of liked the idea of exploring the difference between having a deity as a patron, that is having a formal pact with one, and the idea of having actual faith in that deity like a Cleric would. The Hexblade was alright... It felt like a bandaid though, like they realized they hadn't quite given the Pact of the Blade all the tools needed to build a variety of effective characters without multiclassing or feats. As for the Wizard, all I can remember is the Lore archetype. It needed a little toning down because as written it was way too powerful and stepped a bit too much on the poor sorcerers toes, but I do like the idea of getting a generist wizard back into the game.
So... probably my longest post to date. I apologize if it's a mess. As I've said repeatedly, it's early, I'm half awake, and since I did this all on my phone who the hell knows what auto-corection has muddled up without me noticing... because proofreading in this thing is impossible too. Anyway, if I mentioned the archetype there's a good chance of like to see it published, because if I can remember it in this state of mind I must have liked it.