The thing people fail to recognize with test screenings, and production in general, is what it says on the can: they're tests. Even the smallest edits can drastically change a movie's quality, and movies go through many different forms and shapes before the final cut l. Hell, George Lucas can tell you that even the final cut will go through changes over the years. So nobody's "wrong" over early word on Candyman not being good or test screenings being poor. And for all we know, the guy saw the final cut and just didn't like it. And yeah, this stuff can be subjective.
And while it's fun to hear this kind of stuff, and I love hearing ViewerAnon's input on these movies, it's important to recognize that movies, up until the day they come out, are always changing and that you shouldn't take early word seriously or chastise folks for this.