Cornwall Street is the only tolerable part of the city centre, some fairly nice independent shops/cafes etc, the rest of the city centre is vile, New George Street and Royal Parade should be bulldozed, their only purpose seems to be to serve as a place for zombies to roam and occasionally shout at or spit at each other, you can’t walk down either nowadays without seeing some sort of altercation or the police restraining someone.
I’ve said it before, the main problem is that nobody lives in Plymouth city centre, it’s just a concrete jungle of shops, so there’s no collective desire to make it a nice place to be, you only go to the city centre if you need something, whereas in other towns/cities the city centre is somewhere you spend time and enjoy yourself.