I agree it may be 90% as fun to drive (which is subjective), but you're comparing FWD to RWD.
I'd much rather have a 80's-90's Nissan or Subaru, especially built, than a modern BMW, though. Much more soul in vintage cars imo.
Some vintage BMWs were pretty reliable, a lot of modern Nissans have awful reliability.
It's AWD, but the MS6 has about 100% the repair bills of any old BMW, this person just has no idea what they're talking about. Maybe they owned one when they were new and doesn't realize what long term reliability is like
(Although the Mazdaspeed6 was 90% of a BMW with 10% of the maintenance bill).