Some PrCs are broken for being too weak, or else too bland (IMO most of the S&S PrCs fall into one or the other of those two categories).
A few look VERY powerful on the surface ... but when played, aren't nearly as awe-inspiring. Or maybe they are. Some of them are heavily reliant on GM input to make-or-break them -- input in the form of how encounters play out, what the foes typically are, and so on.
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