There may well be latent demand within the PMT operating area. However, the operators, in my opinion, are not that bad.
One of the major problems in the area is that of poor timekeeping caused by lack of good traffic management by Stoke 0n Trent City Council.
We could get into a very detailed, technical debate of interest to hardly anyone else on the forum here.
I agree that the council is pretty hopeless at many things, including investments in ATT (advanced transport telematics) and their subsequent (non) use, their lack of investment in highway capacity in the 1960's and 1970's when other cities were building roads, and their provision of bus lanes only where road space / capacity is already available. First also have to take their share of the blame for lamentable scheduling and, certainly in years past but still the case, of poor control of their operations on a day-to-day basis.
Longton Interchange, for example, has a 90 second traffic light phasing, and requires, generally, 3 phases to enter and 2 to leave. So that's 7.5 minutes compared to probably 2 phases / 3 minutes by avoiding the interchange. Bus priority operated lights? nah.
However, First timetables are rather generous, so even at peak hours you end up sitting roadside going nowhere. Is either attractive to passengers?
Take my local route. Does a car driver set off from home in the morning, then sit at Blythe Bridge Station (3/4 mile later, 5 minutes timetabled) and wait for time, then sit at Meir Park Tesco (1 further mile, 5 minutes timetabled) and wait for time, then divert all round Meir Heath (10 minutes running time instead of 2 direct to Meir), then wait for time at Longton Interchange (1.75 miles further, 14 minutes running/waiting time), then having waited/wasted all that time, get stuck in traffic on Victoria Road, thus arriving late into Hanley. Outside the new sparkly bus station of course so no benefit from those £million invested by the council!
Blythe Bridge to Longton 3.36 miles and 6 minutes by train, 24 minutes by bus, 29 if going beyond Longton.