Sorry - can't agree with this. It depends on where your preferences lie. My current cans are in my sig, and the quantity of the bass in the HD600 - although definitely not excessive (and nicely balanced with the other frequencies IMO) - is more to my ears than the DT880, SR325i and much more than the K701 ;)
It really depends on your needs... The bass of course is there:
But is overemphasised around 100 - 200 Mhz and doesn't reach the lowest regions, therefore looses impact and complexity, not only speaking from the graph above. The bass on HD650 should be better but still needs some decent EQing. But yeah, those headphones are pretty good... I would choose them over many others judging the FR graphs.