personally going against the grain of everything that was said, listening to the mix with a sub I can say that the lowend isn't all over the place. It could be tamed though so you can bring in some warmth which the mix is missing.
I like to keep the kcik where its at bass wise. I usually don't touch a pass on it. If the drums sound fine on their own but the bass sounds fucked up when you add bass, i would put a pass on the bass and bring it up until the out of control area is gone. Even if the bass sounds fine all by itself, if some of the lowere frequencies fight, you need to get rid of them, and I find that the kick is responsible for a huge amount of the hugeness in a mix so the bass has to be sacrificed rather the kick. Gutiars, I usually find myself passing at around 50, but I use a 7 String and drop C/B tunings, you would be able to get by with more rolloff if you are at a higher tunning, but I really don't think it is necessary.
To me, the trick is finding the right high pass and eq for the bass that really sets the track apart. I like to think of the kick as the ultimate low, and the bass meshes with the upper end of the kick and the bass also meshes with the low end of the guitars. In a way, the bass is gluing together the kick and the guyitars by being right in the middle. Find that pocket and don't let the bass come down as low as the kick.