Consumer Reports Rates Computer Phone Support
From the July 2011 issue of Consumer Reports:
The best computer tech support (via phone) - Apple
The worst computer tech support (via phone) - [Almost] Everybody else (Acer/Gateway/eMachines, Asus, Dell, HP/Compaq, Sony, Toshiba)
Lenovo isn't on the list so I guess they fall in the middle somewhere or they weren't surveyed.