I am very impressed with Matrix and the versatility it offers. There is plenty of room in the back, especially if the seats are folded down. It is zippy and handles very well on the road. I agree that the visibility out the back is a bit limited, and I am also under the impression the paint may be prone to chipping. I also like the higher seating position as it makes getting into and out of the vehicle much easier. No issues after two long trips, and I don't believe it is any noisier on the highway than most other cars.
Fun to drive, plenty of pickup, good seating position, intuitive dashboard.
Perhaps fuel economy, but I'd hate to sacrifice that extra zip.