I love the game and as you say, Playtonic did a fantastic job. I agree the hub is too complex and needs simplified.
I love Rextro as a character but his games are annoying, frustrating and I hate playing them.
The swimming controls i wish were more like N64
Not a fan of the roll move, it's good for speed (would have been good in nuts n bolts instead of cars!) But not intricate movement
I don't like the butterfly system. I actually prefer some resource management. The meter can be annoying. It has only ever worked well in a link between worlds for me.
Camera isn't great. Banjo was better with C buttons.
I do think though that people should judge Yooka-Laylee for what it is and not compare to Banjo-Kazooie. Treat it as it's own entity. It's a good game in its own right and i cant believe I'm playing it