Ok, I'll level with you. These are not great movies. What they are is very enjoyable twisted tales from the mind of Clive Barker. MMT (Midnight Meat Train) is the better of the two, with surprisingly good acting and a very interesting plot. It gets stuck in its own confusion of what it is, though. It spends an awful lot of time on the inner-workings of the main character, which provides some good payoff in the end. It does slow the action down quite bit.
Book of Blood is almost the inverse. It jumps from spooky action to spooky action, without much thought to character development.
The Blu-Rays are sharp, the special features leave something to be desired. The brightest side is that you are getting 2 high quality horror flicks for $10 on Blu. They are enjoyable and re-watchable. Take that chance and pick them up!