I loved both the Game Fuels, although I had a particularly nasty red bottle back towards the end of the Halo 3 release. Might've expired early, I dunno.
I've never honestly tried Typhoon or Whiteout, because the colors just looked plain wrong. I suppose I should get around to them, since Typhoon is back and Whiteout is so goddamn popular, but a soda just shouldn't look that color.
Currently, my favorites are Pitch Black and Supernova, although I'm finding that Supernova tastes like ass if it's too warm. My least favorites are probably Voltage and Code Red. Plain, Diet, Throwback and Livewire all rate just about equally. Baja Blast is OK, but I don't eat Taco Bell enough to drink it too often, and the mix is usually pretty weak when I do get some.
As for my thoughts on Distortion, I liked it, honestly. It wasn't Mountain Dew with stuff taken out, it was Mountain Dew with extra lime added in. And I'm a fan of lime. And it was also notably darker than standard Dew.