This Season is a return to the superior entertainment of Seasons 1 and 2 (I thought Season 3 was only 'OK', with too many below-par episodes).
The scripts have more of a bias towards the CSI team as personalities and, most importantly, the crime plots are once again superior to anything else on TV; the best example in Part 2 being 'Early Rollout'.
One factor of the DVDs which continues to be a disappointment are the episode commentaries. They are, with the exception of 'Bad to the Bone
', awful. Rather than give interesting insights into the episode production, there is too much friendly chit-chat between the contributors and way too much time spent saying how good someone was or what a great job so-and-so did.
I think if a commentary was done by, for example, William Peterson we might learn more; he is after all one of the Producers, so why doesn't he contribute ?
Aside from this small gripe, the episodes themselves are spectacular and the production values excellent.
The 5-part 'production process' featurette is quite interesting.
Fantastic entertainment !