The Thrash Metal Guide, an online database chronicling all things Thrash Metal, has spoken:
"Why Play Around" is a triumphant album, one of the ten best thrash releases ever, pretty much the culmination of the whole scene (and 1988 was indeed the peak year for thrash metal); some of the finest thrash pieces are here, folks: "Wasteland", "Revenge", "Undead", "Humanoid", and all the rest. No more comments about a masterpiece like this.
We don't know much about the site or who runs it, but we couldn't find much to argue with here...
