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They're very neutral which makes them suitable for pretty much all genres.
But if you listen to a lot of bass heavy hip hop, dubstep, etc. then you might find the bass too weak and you might prefer a headphone that boosts the bass more to give you that thump
The amount of bass on these headphones depends entirely on the source.
Just try and listen to bass-heavy songs, like "The Begining is the End is the Begining" by The Smashing Pumpkins and you'll see that the HD600 is not bass light at all.
I'd say it's the best all-rounders because of its neutrality, but lots of head-fiers here seem to prefer the FA-003 to the HD600 for the same reason. I'm not sure if that's just another FOTM, though.
I found the HD650 bit bass heavy and little muddy. My next headphone will be an HD600 and I look forward to it. I think HD600 will be the neutral, balanced headphone I've been looking for. SRH840 is doing a great job, but I miss the open-air sound.