You are right, Jamboo. A lot of reviews are written under "commercial stress" (BMW trying to temper the Lexus enthousiasm of people; and it seems to work here and there because some people start having doubts).
I've noticed that sometimes one review says just the opposite of a different review. Some people complain about the "plastic" interioir parts. What do they want? Wooden buttons? Globally, I think the interior and dash is one of the nicest I've seen lately (in that category).
I have had a test drive with the IS220 and I knew immediately I wanted this car. My Saab 9-3 needs replacement, has almost 200.000 km.
So if anyone is in doubt: test drive it yourself, compare, take your time. The car will proove itself.
And heck, I don't mind if this car isn't being bought excessively, because that way it stays something - in a way - like a seldom gem on the road...