I remember it was around the time the new "Dragonball Z Burst Limit" commercials were airong, and I went on g4tv.com to see their review/inevitable rant on it. That's when I noticed that they hadn't been reviewing games much lately.
This is when I noticed that it started going downhill, and the fact that Will Wright basically had his own segment on the show (practically) everyday, warned me that they were selling out.
The old show, when it was them on a couch reviewing Games for the entire show, was when X-play was at it's best, and funniest.
Taking out most of what made your show funny/good in the first place to appeal to a larger audience is what made X-play lose me as a fan.