MQM and coalition was brought in power in 1983. Since then PPP has no mandate, they have no power to run the city. There are no funds available to any PPP representative in Karachi.
All development or non-development projects run by the City administration. It is always the winning parties who decide about city development.
How come a party which doesn't have any significant representation in city administration for 40 years is responsible for its development??? Karachi's city administration has been receiving one of the largest funds than any other city in Pakistan.
I find no merit in discussing on whom, PPP, or MQM, to throw the blame on for Karachi situation. The result will largely be the same if you swap them. Both Karachi (MQM's turf,) and rural Sindh (PPP's turf) are ran terribly bad.
While I find the discussion of who is worse of PPP or MQM beyond meaningless, I want to state that this mean little when city's administration was effectively defunct for decades.
Up until around 2015, the de-facto Mayor slash Don of Karachi was Altaf Bhai, and Liyari gangs were his revenue department.
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Only in the land of pure:
> Pakistan: Karachi mayor to run office from prison