The Ruins was an impressive achievement and all out great gory fun, in my honest opinion. While the characters aren't really likable, the movie itself is so entertaining and interesting that it makes up for the obvious solid plot and professional development it lacks. While it's certainly not a masterpiece, The Ruins is just an instantaneous breath of fresh air. It's clever in a sense, creepy to the bone and new with an insane entertainment level that it keeps your attention and doesn't let go.
I found the "creatures" an effective and nice, sinister twist to deal with next to the other conflict of being stranded upon the Mayan ruins away from all civilization except the natives who are hellbent on letting them die up there, and I thought while the characters were stupid, that was the right way to handle the situation considering that most people would lose their wit in situations like that after some time, and I always like it when horrors try to make their characters believable, because that makes up for them not being special. It was so compellingly good just to watch what all happened, and I really enjoyed the scenes and thought that it had excellent suspense and a wonderful atmosphere of claustrophobia and paranoia.
Yes, it gets a little bland around the edges, and like I said, it's not like it ranks among the greatest films of all time, but I truly do think it is a satisfying taste of what effective, legendary horrors could do if they were made with better care, because it has all the right substances, but just falls flat a little with it's slight mediocrity. Regardless, it is nonetheless very amusing and indulging. I praise the creators for coming as far as they did with a poor direction, and for toppling over a lot of horrors that have been made in the past decade. Too bad more people didn't see what I did, because it is quite underrated and under appreciated, I think.