Well, The Big Show certainly didn't pull any punches during an appearance on Talk is Jericho. When Chris Jericho asked him about competing in the WWE, Show said that he's grown to hate the weekly TV tapings, saying "they're just long, useless time wasting bulls**t days where you sit around all day for some friggin' idea that absolutely sucks." He said that he prefers live events because there's a lot more freedom and crowd interaction that allows you to play to the crowds rather than the TV cameras.
Big Show even took a few shots at fellow members of the roster (even though he didn't mention anyone specifically) as he stated that many of them are "catered to" and "if they mess up, they get petted on the back." He added that they "can't take an ass-chewing because they fold like aluminum foil."
It's not uncommon for current superstars to say something critical about the product in interviews but a lot of times it doesn't turn out well for the person in question, which can lead to a reduce in exposure on TV and/or lack of push. However, the Big Show has been up and down the road many times so it probably doesn't concern him but this is still a pretty huge tongue-lashing of the current state of WWE on his part.