BF5 got DLSS patch last week. And it does run better with DLSS on, but man does it became a sea of blur: https://www.techpowerup.com/reviews/Performance_Analysis/Battlefield_V_DLSS/
From the comments in that link, a user posted his own comparison of DLSS OFF vs ON vs Simply resolution scaling. Long story short, using resolution scaling gives a better image than DLSS with the same if not better performance.
https://www.techpowerup.com/forums/threads/nvidia-dlss-test-in-battlefield-v.252545/post-3994023
Hopefully they can improve DLSS with more learning patched in.