Eastbourne? Better end of alright, but some way short of lovely.
Hastings kind of the other end of things. A fair few problems but not hopeless/desperate.
Main difference between them being Eastbourne's proximity to other prosperous places and slightly better road/rail connection to London.
I was about to argue that I didn't think Granton was that deprived - particularly given all of the new development in that area - but I checked on the Scottish Index of Multiple Deprivations map and it does look pretty bad in places:
St Andrews? Elie? Lovely. Methil? Granton? Pass.
Are there examples of “it’s alright” seaside towns above some threshold size?