It's noticeably better than 7th gen, but also clearly below 8th gen....
I would say it stays middle way from both in terms of quality. Technically it's closer to 7th gen but the things devs are accomplishing bring the Switch to another level.
PS4: Tryklon | Steam: Tryklon
Switch: 0307-6588-7010 | New 2DS XL: 2037-2612-6964
MacBook Air (Mid 2017) | iPhone SE | Apple Watch Series 3