Well I'm not the reference when it comes to Marshalls (it's my first one) but the 2 channels JVM is supposed to be a mix from the JVM410 of clean/crunch and the OD2. The JVM410 crunch covers with three mode (Plexi, JCM800, modded JCM800). Over at the JVM Forum seems that the JCM800 and modded JCM800, orange and red mode are some of the best JVM sounds.
Having 4 channels times 3 modes per channel = 12 different core sounds.
I can tell you that I use now about 5 different core sounds, all at one click away. I can go from pristine clean, to tweed type breakup, to classic rock, to huge sustaining lead tone (all implemented through MIDI program change command and JVM 128 presets memory).
I did not notice any buzzyness or fuzzyness in the sound.