Belts in bjj mean a lot more than belts in most other martial arts, though.
True, In some places to get a Judo black belt it is faster then BJJ but they still have to be good and get comp points and kata and regulations apply but in some places and with some organizations however this is not the case. In one organization you get a black belt after 5 years of joining Wtf?
Point of that story is that belt ranks can be deceiving. You have to look at the credibility of the belt rank as well.