Well, there's "useless", and there's "bad." My choice is the former, but not the latter.
I bought the MUTANTS AND MASTERMINDS book two years ago on the basis of all the good things I'd heard about it. Unfortunately, I've never read it, Not even once. The binding is still uncracked. And now that the second edition of it is out, I'll never never never have need of it in a game.
Which is not to say it's a BAD book - certainly many people love it - but I've never used it. Not even to flip through and look at the pictures (time gets away from one, dontchaknow). I should have just taken the money and thrown it at one of my credit cards, instead.