Don't know why this needs to be said once again. Sony are not coasting this year. SSM has had some trouble and Driveclub got delayed. The reason there is not a load of exclusives on PS4 this year is because Sony decided to heavily support PS3 in it's final year, something MS did not do.
There will be loads of exclusives on PS4 from October on-wards from Sony, perhaps more when Sony completely gives up on Vita (I'm hoping for a console Gravity Rush) and probably even more when series like Tales and Persona make the transition to new gen.
And PS4 will never lack content from September on-wards, it has all the third party support.
Actually that is the only point that needs to be said. Without something to draw in tens of millions of casuals, a system without Battlefield, Ass Creed, future CODs etc could not win this generation