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Actually, when I actually started to bother, it took me slightly a week or two to recognize both Teams A and K (faces and names. I still can't really tell some of their voices apart, but there's too many and some of them really don't have voices that stand out. At least not to me). After seeing the possible Team B members, I could at least recognize a couple, but that's it. I really wouldn't worry about Team B yet though.
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MM really isn't all that hard afterall. With so much available media and chances for them to portray their individual personalities (which AKB48 doesn't really get as much, and they have much more members, some of which are mostly left out).