See, I'm a latecomer to the Denons. One reason is I never tried them because I thought I'd just vastly prefer the quick bass of an ortho over the notoriously loose bass of a Denon. Well, I was wrong.
Now, I may see where you guys are coming from. I would prefer a tighter bass in my D2000 if it was the only headphone I owned and I was using it as an all-rounder. But, I pretty much use my Denon for my electronica, and for that the slightly loose bass is a godsend. Open headphones lack sub-bass reverb, and it's something I never thought I would have wanted, but as it turns out, I find the sub-bass reverb and slight looseness to work perfectly with electronica, and I've never so much enjoyed the bass presentation on any headphone before.
Also, I don't know if it's because my D2000 is one of the newer production models (2012 production I believe), but the treble is perfect! I remember when I heard the D2000 for the first time, I felt the treble was too hot, and when I bought my own D2000 this was a concern of mine. But really, its treble is even forgiving! Tested with tracks I know to be sibilant, and no issues whatsoever - the HE-5LE is more sibilant and treble happy than my D2000.