As a rule of thumb, you can sniff out the bad hypertext criticism from a distance. It's sour, bitter, and petty. The bad criticism is filled with talk about the death of disciplines, with gloating over the end of careers, with jealousy over the very idea of someone having to pay $20 for a wonderful hypertext, with venom and bitterness and bile.
The good critics remember that we're part of a wonderful new beginning, and they're happy. They're even happy when they don't much like the hypertext at hand. The good critics learn from hypertexts they don't immediately like. They want to learn, they want to share the lesson with us, and they are happy doing it.