jmdt, I'd say that the difference between 3 and 4 health is just as important as the difference between 4 and 5 health when discussing upped cards. Ulitharid used to be incredibly difficult to remove when Elite Otyugh was only 0|4, making it a huge threat. Same thing with Pests. Now those creatures are easier to deal with.
I'm not thrilled about the buff to Pufferfish, but the fact that it was such a strong creature before and still didn't see much play is pretty telling.