is this team good

I think this team is pretty good, some thoughts though:

The UFA signings you did seem quite unnecessary.
Sharangovich, Boqvist and Zetterlund are probably signed at too high an AAV, Bratt likely too low.
Bratt shouldn't be on the same line as Hughes, need to split their elite transitional abilities on different lines as not to suffer diminishing returns meaning Bratt should always be paired with Hischier at 5v5.

I think these forward lines would be just as good as yours for 23-24:
Sharangovich - Hughes - Palat
Holtz - Hischier - Bratt
Gritsyuk* - Mercer - Zetterlund
Foote/Thompson* - Boqvist - Bastian

Graves is unnecessary as Luke Hughes should outright replace his responsibilities for 23-24.
One of Mukhammadulin, Walsh, Okhotiuk and Bahl should beat B. Smith out for 3LHD.

I'm not gonna lie, I completely forgot to add Luke Hughes. I've made some adjustments based on your suggestions. Kämpf as a shutdown center is a necessity imo, something the Devils don't really seem to have at this point. That's also a reason I kept Smith in the lineup over Mukhammadulin. While I do like those prospects, I think having a more defensively oriented dman, especially for the PK, is pretty important.