Information on University of Phoenix on line MBA

Hello,
I am currently enrolled in an on line MBA in Marketing at University of Phoenix completing course # 4. Couple of months ago, I came across a website called University of Phoenix Sucks http://uopsucks.com/
After reading almost every post, I am very concern if my degree is going to have any value after I graduate? There is even some posts suggesting that U o P might loose their accreditation, is this possible?
I live in Canada & there was not much info on U o P available other than that they are an accredited university....My question is, does anybody here know how an MBA from U o P is perceived by employers? I am a working adult, I am taking this degree to advance my career. Also, are Capella or Walden perceived as better alternatives or are they on the same level as U o P? If anybody has any tips or other suggestions for comparable programs, I would greatly appreciate it.
Many thanks!!!
Very, very, very confused