I enjoyed them. I got them after I read Karen Traviss' Halo trilogy, (which is also my favorite of the Halo books that I have read,) and they are actually really good. They give a ton of characterization to the main cast. Karen's good at "the world's -blam!-ed, but we've got a job to do anyway." She also wrote the plot for GoW3, which is why it took such a 180 on quality from 2. Worth a read if you like solid, if not high brow sci fi.