Eh to each there own; however TV DVD's are a proven concept and it's apparently a multimillion dollar industry.
I'd say I enjoy them, I've got M*A*S*H, Family Guy, Futurama, American DAD, CSI, a whole bunch of shows actually. My Dad's got The Muppet Show, A*TEAM, Hogan's Heros.
I too prefer TV on DVD, I still have a DVR from the cable company which I use heavily, but the DVD's are good to watch when I want and to watch more then one episode in a row. It's also great if you've got a buddy over who's never seen an episode of a show and you want to introduce them to it.
- D