3 days seems too short to catch up on seasons of series I like, which I expect is the point of the free weekend – get hooked on the first couple episodes of the show, then pay for a subscription to keep watching.
I plan to instead use one of the free 3+ month trials for new and existing offers later this year. These 3-4 month trial offers have been available continuously for years. When I last was a member 1-2 years ago, I liked Severance and Servant, which have had new seasons since then. This time I plan to also check out Silo and Dark Matter, maybe some of the nature shows as well.