Exclusives play a roll, but let's be honest here Microsoft fucked up the launch so hard it didn't really even at the start become a factor.
DRM issue and getting half of the halo collection on disc + having to download the rest of the game killed it for me without even considering what the positives were for XBOX.
Sony on the other hand waited to see how the gamers reacted to DRM before announcing their intentions and when the backlash come played up being saviors against DRM and it worked.
From that point Sony has hit every right note and has grown stronger and stronger and now we are seeing great exclusives that may not all have been exclusive if Microsoft didn't fuck up hard and fall so far behind the race.
Even now Microsoft's answer was just let's make an upgrade more powerful than the PS4 Pro without really anything behind it to showcase it.
