I gotta say. Odyssey is actually as pretty solid game. I'm not super far into it yet but I'm finding it pretty enjoyable, more than I have for any Assassin's Creed game between ACII and the present. Maybe it's because I started playing it six months after release but I haven't encountered a frustrating bug yet. I don't see why anyone would think its "far from being a great game". It appears to do what it intends to do pretty welll so far.
My thought is, remember Odyssey was released in the same time slot with RDR2? I played the latter first and started my journey in Odyssey right after, it turned the first hours in Odyssey was just so painful in all aspects, the comparison was like day and night, but then I still platinumed Odyssey, so I can say yeah it's enjoyable, but it's just not great.