What is it with Christian filmmakers and making poor movies? Ok, I understand low budget--that's not a problem. But the acting is just--pathetic. Which really has nothing to do with low-budget. Plenty of indie films use unknown actors who look like they've got more experience than a high school play. And the archaic use of flashbacks and slow-motion makes this movie feel like it was filmed in the early 90s, not a product of the later 00's.
As a terrible movie, though, it does has its purpose--an ironic LOL viewing. Tacked on to a viewing of the film Adaptation (in which one of the characters, Donald Kaufman, writes a movie script called "The Three"), it is funny to see how close Thr3e's plot is to the one outlined by Donald. But the similarities are (probably) coincidence: the Christian entertainment industry doesn't really see value in ripping off obscure films--so they set their eyes on the big money-makers. Which in this case seems to be the Saw franchise. Except, of course, without the cleverness, gore, and thought-provoking monologues. Se7en seems to be a popular comparison point, too, and I can see that for the riddle aspect (and the title), although that is a weaker influence.
If you want a good time, watch Adaptation., then break out the booze and play a drinking game while watching Thr3e. Every time Laura Jordan (actress who plays Samantha) pushes out/pouts her lips, take a shot. I don't know if it was a directorial decision to have her lips pout so often (because they thought it would look attractive?) or if she did it on her own (because she thought it would look attractive?), but it's ridiculous, and totally shot-worthy.