I haven't persoanlly watched any TV shows on DVD except for Fawlty Towers, and that would be true, except that in addition to the commecials issue, even the pay channels control your viewing schedule, which is also a large component of the "opiation."   
I watch lots of (usually) old movies at my leisure, hitting the stop button at my lesure, and life is much better. I guess both of these options are available electronically now as well on a pay per view basis, but Netflix sure works for me so far.