It's hard to make a direct comparison because they're trying to do different things. God of War and Spider-Man were released on PC 4 years after their console versions.
As someone who's looking forward to both new Elder Scrolls and Spider-Man 2, I've only considered buying a console for the second: I'll just update my PC for the first.
Yeah, but that just proves my point further: having more exclusives only matters to the point that the exclusives drum up interest; which for my household won't happen with Microsoft for another 5+ years unless they get a surprise in there.
As someone who's looking forward to both new Elder Scrolls and Spider-Man 2, I've only considered buying a console for the second: I'll just update my PC for the first.