I have to admit that I'm a sucker for LOST re-runs, but otherwise I wholeheartedly agree with your sentiment.
G4 has become SpikeTV 2. It lost everything that was great about Tech TV (LOVED The Screen Savers, HATE AotS); I liked Kevin Pereira when he first joined... couldn't stand him by the time he left; all of the hosts they have now are terrible: Blair what's-his-name sucks, that Candace Bailey bimbo is beyond annoying, and Morgan Webb... well, I've never liked her to begin with. About the only ones I can think of that I actually think are cool are Matt Mira, Jessica Chobot and Kristin Adams, who is delicious looking.
Truthfully, it really doesn't faze me that the channel is going non-game soon because the only time I find it productive to watch it anymore (aside from LOST, which I can watch anytime on blu-ray) is during E3.
Unfortunately, GTTV suffers from a similar dilemma for me, as I can't stand Geoff Keighley. Argh... I can't win!
/rant







