For me, it's the exact opposite. I thought Hostel was 100X better than Feast. But don't get me wrong, I loved Feast. I even bought it. Hostel is just one of my favorite films of all time and I admire Eli Roth as a filmmaker very much.
Personally I felt like The Descent got a little bit to much hype.. I think its still number 2 on my list but it received an uncanny amount of hype.. The ending was very disappointing.. They should have kept the original one..
As stated in another post, of these movies I've only seen Feast. I thought it was one of the best I've seen. I am still waiting to see some of the other films including Hostel, The Decent, and Slither.