The truth of the matter is that there's an element of luck involved in the "value" of exclusives; Everyone starts out intending to make a winner, but some inevitably under-perform critically or at retail, whereas others do as well or better than expected. The PS4 has, by and large, been incredibly fortunate with this.
So to say that its just a matter of there being exclusives to help PS4's performance is missing the important bit, the quality of them has been unusually high on the whole. This isn't an easy thing to replicate.
It may be easier to replicate than you might think. Sony has seemingly replicated it several times over. Hence the memes that all Sony games are the same, or the phrase "movie games".
I do agree that the quality of them has been high. Higher than MS's output this gen overall. Sony's first party output is VERY well polished with good story telling and graphics. Anyone who debates that is a console warrior of the first order.
However, there's no secret ingredient, magical spell, or really luck to why their games are so well recieved. Those types of games scratch a very particular itch that most other games can't, hence they become media darlings. But to think that the quality can't be replicated is a bit misguided I think because it has been done many, many times.