Does he have a club at the moment after leaving Barca?
https://barcauniversal.com/just-in-barcelona-reach-full-agreement-to-terminate-veteran-stars-contract/
To be fair I also remember the same comments about Mane's first game, and he went on to be ok.
DD may turn out to be utter shite, but a couple of sub appearances seems a bit early to write him off completely.
I think some of the best times I've seen as a fan have been where the team have been very fit. The Pochetino era springs to mind where we punched above our weight by high pressing teams into submission.
Like what I am seeing from Still so far.