Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible technical production of Blue Ray DVD!!

I am simply appalled at the poor production quality of this DVD. It had been delivered while I was traveling a great deal. When I was finally home and had the time to view it, it was just too frustrating. The navigation on the DVD to get to the Menu is horrible. The DVD video at certain times just stops and then starts in slow motion. And, it's not my player which plays all other Blue Rays without any such problems!! It was too late to return/exchange the item. I can't make comments on the content since I was never able to view most of it anyway!!