Well I got one of the major game questlines done and dusted and I am quite pleased with how it panned out. Since my wife is back tomorrow I'll have less gaming time so I'm glad I made a lot of progress today!
Respect for doing that. I hope you don't get burnt out now that you're progressing through the storyline having seen all the sights. Yes there is a brick ton of design repetition going on and the more you explore, the more you really do notice it. At 95% completion I can safely say that Origins had a tighter, more cohesive world. Things looked unique from city to city most of the time and the feeling of similar game design really wasn't present - since I only played Origins a few months ago it is still fresh in my mind so I remember it vividly.
I think Ubisoft really played it safe here and removed a lot from Origins, in order to fit additional game features in that I cannot mention. I think Ubisoft Quebec made Odyssey and Montreal are the truly talented outfit. What you end up with is a game where you miss the smaller things that made Origins somewhat enjoyable - for example:
1. Hunting animals and seeing predators come out at night.
2. Better weather cycles.
3. Expanded use of Tombs (Odyssey ones are less imaginative than Origins!)
4. Poor Arena usage vs Origins
5. Avenging other players deaths.
etc
I could go on but at the end of the day Odyssey is still an excellent game overall. Players will be comfortable in either Greek or Eygptian eras.