Hi horror group,
I caught The Collector last night; I was shocked to have mostly really, really liked it.
Apparently it was conceived as a Saw prequel, and the advertising pushes the writers' involvement in Saws 4-6. They did a decent enough job turning it into something different enough to stand on it's own. It spends enough time developing charcters and plot to get the viewer invested in the events, and sets everything within the film up well.
I don't like the "torture porn" label, but since it seems to have taken, I'll use it here. If you've not been a fan of the genre, Collector will definitely not be for you; if you've come to at least be able to tolerate it, give this one a shot.
I'll also note that Gary Tunnicliffe of some (all?) of the Hellraiser series does effects here, and that you can tell; I don't know if he designed the villain, but one or two set-ups & some torture gore are evocative of that work.