Better than average anthology. I’ve noticed a close, but inverse relationship between title hype (“Best … of 2016”) and the quality of the stories. This volume features stories—mostly classic and modern tales published by Baen’s (surprise) usual suspects—about monstrosities. Not necessarily monsters, per se. It succeeds.
Don’t read the Goodreads.com summary. It contains both spoilers and errors.
My personal favorites are John W. Campbell’s “Whoever Fights Monsters” and Sarah A. Hoyt’s “From Out of the Fire.” Both involve an element of humor. Only Robert E. Howard’s Conan-esque monster killer tale was a repeat for me. (Wonder how his 1935 paean to Arianism fared later?) Several were outright horror stories, a genre I do not enjoy.
Interestingly, several stories were written to order for pulp SF magazines back when that was a common approach. Their quality is still high.