First, they could not keep Sarah Silverman in check with her comments about Britney's kids, like they said they would.
Second, MTV had a whole act rehersed and ready when at the last minute MTV chickened out and made Ms. Spears change the whole act. It was supposed to be a singing show and magic act with Cris Angel, with more mature dancing. MTV ditched the plan shortly before the show over concerns of weight of the magic equipment and the sexiness of the dancing.
Third, there might have been a wardrobe malfunction. There are pictures that make it looke like one of the heals on Britney's high heel boots broke. While this is not MTV's fault, it certainly added to the suck that was Britney's act.
Anyway, this just adds to my view that MTV sucks, and has for a long time. There last vestige of cool was lost when MTV gave up on music for reality tv.