Beta, you're right The rest of Birmingham is an absolute shithole 
Passing through somewhere does not give you a good enough insight into a city that your comments are justified. Birmingham, like any large city, has good bits and bad. However, a lot of money has been invested into improving Birmingham, to boost the local economy.
The number of people I know who speak quite convincingly of Birmingham's shithole status, without ever having visited the place, is astounding.
As for Manchester-Leeds conurbation, are you on crack? They're completely different cities, different counties.