Well at first after the opening scenes, I thought this was shaping up to be one of the most epic episodes ever. The killer seemed seriously evil, and revisiting a case from the late 60s seemed exceptionally exciting.
However, while the first half of the episode did impress me a lot, I wasn't too fond of the ending. The last few scenes seemed heafvily anticlimactic, and I think teh wrietrs could've done a whole lot better when mapping out the ending of the case. The last few scenes were not very exciting at all.
In other news, I enjoyed some of the Reid scenes, and particularly the scene with Emily. The birthday scenes at the end were nice, particularly Rossi giving his love! <3 Those scenes were really well done.
All up, still a very good episode for the most part, but I have to say that I found the ending anticlimactic. Hopefully that'll not be the case with the next one! :p