They have so many issues in their powertrain. I work for a major oem and we chose not to even test the rivian vehicle for competitive benchmarking since the performance was so poor, there was nothing to learn from it.
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 point i am trying to make is about 'vehicle integration'
most of the oems don't make their own emotors. they 'engineer' vehicle attributes and provide the suppliers like Bosch with system level targets. this process is generally referred to as target cascading. if i want motor to sound xdB at driver ear, my vehicle needs to provide ydB isolation and then source needs to be at zdB, if this process is not hashed out well, you end up with poor isolation. you also have to consider variability in source and your manufacturing.
This is the area where an automaker shines or crumbles, doing this poorly results in poor experience and hence poor reliability/quality. most of major oems think rivian is struggling in this area and just now laid of most of the sme's lol
