It's only recently that I've found any measurement to be very useful.  The Headroom FR + square wave + distortion graphs were cool, but didn't correlate that well to my experience with a headphone- they could measure really well and sound terrible, and vice versa.  Marv's CSD's are the first measurements I've ever found useful as an indication of how I will like a headphone.  Which may be because they are measuring the aspect of a headphone's performance that I'm most concerned with, and which is most often very problematic.

Yeah, same here. The CSD thread on HF was the first time I truly felt that measurements provided an intuitively illustrated correlation of what we hear with headphones, other than FR graphs on Headroom and IF. Admittedly, I still can't truly read a square wave response graph (or correlate it to how I should be hearing it), but I can't imagine it being as intuitive as a CSD, where you can easily spot problem areas at certain frequencies.

My earlier comments about objective measurements not yet providing the whole picture had more to do with things like how you can't tell how big a headphone's soundstage is, or the effect of different amps on headphones (as two examples). Or how perfectly measuring amps don't necessarily equate to a great listening experience. There's still some domains where your ears will ultimately must be the judge.