I guess the real title is What's THIS For...? Shouldn't there be a question mark and not an exclamation point! See what I did there! Again! The second Killing Joke record is also awesome. It might not be as good as the first, but it's pretty fantastic.
What's THIS For...! was generally well received by critics. Trouser Press described the album as "nearly as terrific" as their debut album, "bringing funk to ambient music, implying feeling sublimated in a chaotic world".I think more than a few people recognize that Ministry was influenced by this record.
Paste magazine's Josh Jackson listed the album at No. 48 on his list of "The 50 Best Post-Punk Albums", noting that "the real genius here is the human emotion that comes through such spare efficiency" [source]