I've got to agree with you: the big co stuff isn't always heinous, and at worst most of it is merely boring and unimaginative.
There have been many slogans over the years, but to me, Coke Is It. It, however, is getting harder to find at restaurants these days, outside of McD's and Burger King, and Pepsi just isn't It (and Fountain Coke is almost always superior to cans or plastic bottles). I understand your beverage messiah may be different, and I won't attempt to change you. Imagination isn't needed here.
On the other hand, Pepsi's Mountain Dew line has been a source of imagination. Code Red, the only beverage to have a computer virus named after it, is an all-right drink. Live Wire is too sweet for me, perhaps as a mixer it would work. Their Midnight Blast or whatever the black one is called is OK, my kids appreciate a purple drink with blue foam.
They're pushing the envelope a bit for a mainstream company, and that's a good thing.
Other surprises in recent months include Sunshine's twisted Cheez-Its in Blue Cheese and Hot Sauce flavor. Oooh, they're dangerously good.