These last two seasons have really fallen off badly. The story lines are hokey and implausible. The acting is just bad from much of the cast. Some of the guest stars have good resumes and have proven they can act but here they are just flat, unmotivated, and completely unconvincing. CSI has been an A plus rated show for most of its 15 season run. They've had a few B's here and there but the last two seasons have been chocked full of C and D efforts. The few original cast members that remain have had their rolls minimized significantly and that too hurts the shows quality. It's evident that it was definitely time to say goodbye to this one. I have watched the first season of the replacement CSI Vegas and it's back up to standards so maybe the writers, cast, and crew of the original just got too tired.