Honestly, Connie, I couldn't tell you. I'm not a big special features guy. I buy Blu-rays because on a nice sized HD set, a DVD actually looks kind of bad to me. Worse than Netflix, which is my standard viewing source. So if I'm going to pay for something, I'll go with the higher quality thing. I also find that since I tend to buy movies I want pretty early after their release, I can usually get the DVD/Bu-Ray/Digital combo pack for the same price or a little more than any one of them alone, so I go that route.
I don't remember the last time I actually
watched
a blu-ray. I hate menus and loading times. If it doesn't come with a digital copy, I rip it myself. But I like having the high-def source around if I need it.
I don't know why I get so picky about special features, I only watch them on Tolkien. Otherwise I'd rather focus on the story itself, and Making Of stuff dilutes that.
I like deleted scenes but, well, YouTube.
For me it largely depends on who's doing commentaries and such. If it's a tight-knit cast that seem to enjoy each other's company, or a creator like Bryan Fuller who's fun to listen to, the commentaries can be more fun than the product.
I used to love commentary tracks and bonus features and what not (though I didn't necessarily need to listen to Christopher Lee being a pompous Tolkien-ite on his commentary tracks) but then I had a kid and I'm lucky to have time to watch the movie ONCE.
I do remember being excited back in the day going through the Buffy DVDs and discovering which episodes had Joss commentary. Those were almost always fun.
Christopher Lee and John Rhys Davies ruined all commentary tracks they participated in.
Some, like Tropic Thunder, are better than the movie itself (but I think RDJ makes all movie commentaries better).
I only like the Hobbit track on the Fellowship DVD, because Merry and Pippin are such fun, and they keep interrupting Sean Astin and his "serious moviemaking" blah blah. For TV, I'll look for particular people together, because they play off each other so well.
From the LOTR DVDs, we still sometimes say to each other, "Viggo, I can't swim. ... I'm even afraid to take a bath!"
I still remember the Farscape tracks where Ben Browder kept trying to get his costars to loosen up and give good commentary.
Tragically, my Farscape DVDs have no commentary. I have no idea what's up with that.
