I feel I should start by addressing the obvious elephant in the room regarding this game. AC Odyssey really, really wants to be the Witcher 3. I reckon it's a good game to imitate though.

You have a huge open world that is soft-gated off by level requirements, like the Witcher. Admittedly, the game world is the strongest part of this game. UbiSoft put in the effort to really make you feel like you're experiencing ancient Greece. The buildings and statues of the cities are awesomely recreated. They even have the statues painted like they should be. The countryside is bright and varied with mountains, olive groves, and farms. Some of the rock walls you spider climb up did have some poor textures that didn't load in.

Greece being more a collection of islands, we see a return of sailing to Assassins Creed. It's pretty lackluster. I mostly used it to reach new islands & for maybe one or two missions. UbiSoft may be trying to rebottle the lightning that was Black Flag, but triremes full of archers can't compete with the Golden Age of Sail. When I did any lengthy sailing I was just wishing I was on the Jackdaw instead. Also, the sea shanties in this game don't work as well because they're in Greek, which makes them less catchy than the pirate shanties.

The combat is much more Witcher now as well with light and heavy attacks. Assassins Creed has always felt a little clunky to control and that is still present in this new combat. The default setting has attack on the R1, which is really weird for a sword fighting game. Luckily, you can change it to a more familiar control scheme. However, to counter an attack you have to hold R1 & L1, which, thanks to the clunkiness, can be a challenge to hit fast enough. I had to switch to easy mode because of the awkward combat. And this game is filthy with bullet sponge enemies, or sword sponges I guess. The mercs, monsters, and special animals all just have insane health bars until you get 2 levels above them.

The last thing I can think of that they borrowed from the Witcher 3 is some of the story beats. AC has dialogue trees with lie, threaten, and charm choices that have no real point. You also begin your journey, or odyssey if you will, by searching for your lost mother. You do this by visiting three different places she was spotted, talking to the locals, and watching flashbacks. And some of these flashbacks are unnecessary. ex: "Your mother was a thorn in my side" ~flashback~ "You are a thorn in my side, lady" ~end flashback~
It's all a discount version of the search for Ciri. The whole main story was a bit drab as it was made of the worst type of fetch quests. By the time I reached Sparta, I was just chugging through the game, begging for the end. The Spartan king give you two chores, and then those chores are broke down into 2 or 3 more chores, which may have 2 parts within them. They usually boil down to sneak into this fort and kill this guy or steal this item.

I played through the story as Kassandra because I was told she's the cannon character & I'll admit I'm a simple man who likes a Mediterranean accent. She's a fun enough character to follow, especially cause I played her as an arrogant merc with a temper. And there's plenty of historical characters you hang out with that add to the game. Socrates was one of my favorites, he's sorta like that guy in college who is always baked & talking philosophy. And Alkabedes took diligent notes the day the Greeks invented innuendo, he was enjoyably corny. Sometimes the dialogue felt off, I don't know if Greeks said "fuck" & they drop the word "Malaka" so much it feels more like a future sci-fi swear.

There's a bunch of side missions that I largely ignored after awhile because they aren't interesting either. They work in the Witcher because you get unique dialogue encounters or a new monster to fight at the end, but in Odyssey it's just more sneak here, kill this.

Two things on a more meta level. I hate that I notice this, but it does seem UbiSoft is misrepresenting history in pursuit of their progressive ideas. Sure, I assume Ancient Greece was pretty "anything goes", but one of the facts mentioned in a loading screen says how women couldn't compete in the Olympics, then Kassandra competes in the Olympics with no one raising an eyebrow. They could've at least played it up like a cheesy 80s movie.

And this game is very far from the Assassin Creed of old. I don't mind most the changes. I found the Templar/Assassin battle uninteresting & after so many games the gameplay needed a change-up. Honestly, I would be okay with dropping the whole assassin pretense and let us just play as different heroes in history; a Greek soldier, English pirate, etc. Still I do miss the sort of HItman-esque assassinations from Syndicate, the fact stealth attacks are one hit kills, and the little silhouette that marks where the guards last saw you.

All in all, I enjoyed being a part of an Ancient Greek world with some fun characters, but the mission design left something to be desired. I still want Assassin Creed to go on, because they can take you to random historic periods that other games don't touch often.