Impressive work by Sony, they may not have the highest rated games released that gen but they certainly have a lot to offer and of great quality, but even more impressive is when you look at their 3 top rated games and they are all new IPs that were born that generation, (Variety and New IPs is what i want and they sure deliver in that).
Also game development seems to only get longer every gen, just look Naughty Dog who released 3 Uncharted games and TLOU in 7 years and this gen i think they will only be able to put out UC4, TLOU2 and Lost Legacy (which is almost as long as the first UC so i think you can count it in), and thats part of the reason why i hope this gen is at least 7 years long (2020) so we can get as much games from it as possible.