Does a blu-ray need to meet a specific criteria of yours to warrant a purchase?

[Werdsniper2]

What I mean by this is, are there any traits that automatically qualify or disqualify the possibility of a purchase for you?

For example:

Personally, I typically refuse to buy a movie unless it contains a commentary track of some sort. There can be an abundance of special features, but if a track isn't one of them, then I won't buy it. There are some rare exceptions to the rule, but only two of them.

A) If a good movie is way, way too cheap to pass up ($4 or less usually)

B) If it's a good movie directed by someone who refuses to do commentary tracks (Tarantino, Spielberg etc...) and may never get one at all.

Not liking a movie is obvious and doesn't count.