Consumer reports issue for Jan 2009 is out and the ratings for cell phone companies are not surprising.

Overall for customer service(best to worse).
1. Verizon
2. AllTel
3. T-Mobile
4. AT&T
5. Sprint

In terms of service availability in the Los Angeles area(best to worse)
1. Verizon
2. T-Mobile
3. AT&T
4. Sprint
Ranked by reader service score.

When ranked by connectivity:
1. Verizon
2. Sprint
3. AT&T
4. T-Mobile

Note: T-Mobile had the worse service availability, which I can attest to personally, I can drive for miles on the 134 and not get service in the Eagle Rock and Glendale area, between the 2 and the 210.
AT&T had the worse static on the line, which I have experienced.

These reports are not surprising based on the everyday complaints we hear.