Assassin's Creed Odyssey is an excellent Open-World RPG with well-written characters, decisions that matter, combat moves with impact, a multitude of valid gameplay styles, the fun naval combat of AC: Black Flag and a beautiful world.
A good Assassin's Creed game, however, it is not.
Since you have items now that have stats, an assassination is no longer a guaranteed kill - so even if you manage to stealth your way up to your target, it's perfectly possible your target survives getting stabbed and you get into a fight anyway, often involving all those guards you snuck past. Unless you're decked out in a complete set of assassin-damage boosting gear, you're usually better off getting into a fight and then deal with the bounty that's placed on your head, and they're pretty substantial early in the game (while becoming trivial later on). Now, you CAN either lay low and wait for your bounty to lower or track down the bounty-giver and stab them - but in the meantime, you'll have to deal with mercenaries coming after you, which are real sons-of-bitches to defeat. Combine that with the fact that counters no longer instantly kill your opponent and a leveling system that discourages you from exploring large chunks of the game world until you're almost topped off, and you have a game that plays much more similar to the Witcher III than one of the games in its own lineage.
Not that that's necessarily a bad thing, mind you. But you should be aware of that before going into it. I'd give it 8/10 grains of salt overall.