I was actually very disappointed with bdsp. Got it on launch day
It's definitely worth getting if you haven't played the originals, and it actually looks nicer than SWSH in the battles...but not in the overworld. It gives access to many Pokemon that SWSH doesn't, which can be worth it on its own for some people.
It's not a bad port, but it's far more of a port than a remake. For everything it adds, it takes something away, and/or leaves you thinking "okay that's a little better but why didn't they do it this obviously even better way?"
It plays like the developers went "Ok we have to remake diamond and pearl" and then only played diamond and pearl for inspiration. Didn't take a look at any of the new improvements added in Platinum, or SWSH, or BW, or ORAS,
Wow this is turning into a rant