I was able to find Mountain Dew Game Fuel at a nearby Walgreens on Friday here in Chicago...
I really, really wanted to like this drink. It's substantially different from Code Red, which I think is the obvious comparison. I actually think the flavor shares a lot in common with LiveWire, if that makes any sense. It's to cherry sodas what LiveWire is to orange... same intended flavor, but not quite.
Upon first tasting, it was good, but I personally fell that the aftertaste is what kills this drink in my opinion. It's substantially lacking and suffers from a medicine-y flavor. That was somewhat disappointing to me.
It's not a horrible drink, but could have been so much better.
For those interested (or completely bored out of their minds

),
my full review.