I dont think it needs mutliband to make it sound better, but it does help me out a bit with the lo and hi end and very rarely to slightly tame or bring out a mid band range. Is it not normal to multi band compress when mastering?
My take on mastering is usually just simply 3 band EQ then multiband compress, then compress and limit then compress then boost with volume maximizer. No spectralizer thingy majigs or fancy 31 band EQs etc.
Massive master what is your most common chain for mastering? Do you use fancy phase EQs and 31 bands? and do you use frequency analysis tools to help you get the right sound or do you use your ears rather than a mad graphical representation?