Anywhere large enough to support an SPFL team is unlikely to be homogenous enough to fit simplistic definitions of "good" or "bad" - Paisley contains both Ralston and Feegie for example, Greenock has Fort Matilda and Larkfield.
For the same reason, it's also pointless naming cities as being the worst as they're a patchwork of wildly different areas - try telling the punters in the £1.5m houses in Hyndland and Jordanhill they're living in a dump...
The real worst places for my money are the villages and towns which have been drained of all resource and ambition - a lot of the former heavy industrial areas for example, where hopeless unemployment is the norm. There's nothing more depressing than one of those wee main streets where the only things not boarded up are a Spar, a bookies' and a couple of jakey-looking pubs.