I've never been able to read MMPBs and have always avoided them as much as possible. The font was either small, or blotchy, or just plain ugly, the books were stiff and hard to hold, the paper didn't even feel "right" in my hands, and I can't remember what else (or maybe that was enough.
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I've always been a fan of trade paperback and hardcover books; they seem to me to be nicer to look at, consistently cleaner fonts (typography), it didn't feel like I was breaking them when I opened them and the paper felt nicer to touch.
(My own opinions, of course. If everyone thought like me, there wouldn't *be* any MMPBs.
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