The Denons seem to be pretty love/hate around here. I've been listening to my brand new pair of D2000s (just delivered this morning, from amazon) for a few hours now and I'm enjoying them a lot. Impressions so far...
The bass isn't the tightest I've ever heard but it's hardly bloated or muddy. There is definitely more than some people will prefer, but they're hardly bass cannons. The mids are pretty smooth, and not recessed to my ears. The treble lacks the sparkle that many people like, but that makes 'phones fatiguing to for me to listen to, so that qualifies as a plus for me. All this may be subject to change with break in though.
If you're looking for looking for lots of tight bass plus some serious sparkle then I'd recommend the DT990/600s. I loved everything about them except for the excessive (to my ears, anyway) treble. I'm most likely going to return them soon and keep the D2000s.
Also I'd say EQ is something to use to make 'phones you already like even better, and not to 'fix' something that you really don't like at all. That's because it's not always convenient or even possible to apply a good EQ to every source you might listen to. If you use EQ on your favorite and easiest to EQ source, like for example your computer music player program of choice, then you'll end up hating the sound on other things. Movie player? Probably not as easy to EQ and you'll most likely have to use a different EQ anyway. Your DAP? It most likely has an inferior EQ. A fancy SACD player? You'll have to shell out for a hardware EQ. Video game consoles? Same thing. It also usually takes a good parametric EQ to fix something like a resonance peak, but usually a dinky graphic EQ can give you a little more bass, or treble, midrange depending on your preference. I like using EQ. I think it's quite helpful a good deal of the time, but its not a panacea.