My only complaint with calls to D* cust. service is that many of my calls get transferred to depts. with more of a focus on sales instead of cust. service. (Ex. they want me to change premium packages instead of my desire to just drop one.) When sales is a large part of poss. incentive, simple cust. service often gets pushed to the side.
This has led to immediate callbacks more times than with E*, and they would just simply hang up on you when they didn't know what they were doing.