3DMark's latest DLSS test show outstanding performance gains with the right implementation. Meanwhile, real world games like Battlefield V and METRO Exodus suffer from DLSS artifacts, especially in resolutions under 4K. Nvidia is aware of these problems and already working on fixes that should be released with an upcoming driver update.
https://www.notebookcheck.net/Nvidia-to-prioritize-DLSS-improvements-at-low-resolutions-in-upcoming-driver-update.410206.0.html