I've put all the games available on Xbox and Playstation that I'm interested in in a sorted list based on my preference. While it is true that the Xbox exclusives average better than the Playstation ones, they both fall short of the cross platform games.
For example, while I would like to play Sunset Overdrive more than I'd want to play DriveClub, I'd still prefer to play Shadow of Mordor, GTA V, Dragon Age Inquisition, and Far Cry 4 over either two. Those exclusive games are about equal with my interest in Call of Duty Advanced Warfare, Evolve, and The Witcher Wild Hunt. Not being able to play an exclusive is really not a big deal. It'd have been a toss up if I played them anyway. If Destiny hadn't turned out to be such a dud this effect would have been even more pronounced.
TL;DR; Doesn't matter because cross platform games are now more dominant than exclusives.