Adventure never included the kitchen or tent you had to purchase it, they just are re-working it and or discontinuing it. The main issue is their lack of communication around timelines.
They are using BOSCH motors and Samsung batteries. At least until their new dual motor config comes out with their own motors. I'd say this is neither poor or great since these are mostly industry standard options.
Munro has done a very detailed teardown of both the Rivian and the Lightning. The main complaint of the Rivian was that it was overbuilt and they are spending too much money. Otherwise, it's been given very high reviews for quality.
I suppose you could argue that the quad motor config is maybe something other OEMs wouldn't take up for many reasons, but it's not a "Poor" choice. It's resulted in one of the most unique vehicles to ever exist, which was probably a very good brand building strategy. The problem with Rivian now is that they haven't been able to pivot to mass market vehicles quickly enough.
The main issue is both. Communicating constantly is not helpful if you also change everything you say all the time