I guess Horizon is Ubi-esque a bit, but not really.
It has a fully focused single player that is filled with unqiue cutscenes, missions, dungeons, whatever you name it. The single player doesn't feel copy and pasted, it feels like someone gave a damn and carefully thought it out.
It's side activities are also not awful or overwhelming in number. The dungeons are few, but all unique in whats inside them. Each one also unlocks new things you can do to the robo dinos. The Long Neck things are also few in number and also usually in unique areas. It also doesn't feel pointless to do them.
The raider camp things are the most Ubisoftish, but they are at least tied to a side quest with it's own story.
If anythng it felt like someone made a Ubisoft game except actually good and not with a bunch of garbage content and fat that just crowds out the map.
I don't know when I think of open world Ubisoft game I think of a map with a millions of shit on it, a boring copy and paste mission design, and pretty much nothing but repeated thoughtless content. Which is not Horizon at all.
Also the game understands pacing, unlike most open world games where it's here is the open world whatever.