I'm not worried at all. I know it's going to be trash in its most absolute form.
Can't say Nintendo has done anything to convince me that they are capable of doing a good delay-based netcode since Mario Strikers Charged, or a good rollback-based netcode since Mario Kart Wii.
But at least it's probably going to be delay-based, so no cheating on that one.
Also, Switch's Wifi just barely works and almost no one is going to actually buy an Ethernet adapter or to even be able to use Ethernet at all (Hi handheld mode), making things that much worse.