Nice pickup on Siren. I hope you got it at a good price. A really underrated horror gem.
Yeah, based off VGPC, Siren and XIII were a little under market. However, Ultimate Spider-Man LE was super cheap. I think they priced it as though it wasn't the LE. It included the slip cover, case, manual, comic and disc so overall pretty happy.
I played each game for a little while last night. I was really impressed with XIII despite the fact that the controls leave a little to be desired. It has potential to be a really enjoyable game. I also really like the cell shaded graphics for both XIII and Ultimate Spider-Man. But I need more than just a few minutes of playing time on Siren to give any kind of opinion.