Red Tail is an amber ale, but one that definitely tends toward the lighter and hoppier side of the genre. It has a citrusy flavor that is strongly suggestive of Sierra Nevada's Pale Ale, and in fact, when I first had this brew way back in the day, I mistook it for a pale. You could almost describe this beer as an amber-pale hybrid, given how strongly hopped the brew is and how mild the malt flavors are. But while Red Tail is substantially lighter than your typical amber, it has a distinctive toasted barley flavor that places it firmly within the limits of the amber genre. The beer also boasts a light body, plenty of carbonation, and a dry finish, which add up to make it quite refreshing and very drinkable.
There's no special subtle flavor that makes Red Tail such a hit in my book. Rather, Red Tail's success comes from its ability to balance bold citrusy hops against a lightly toasted malt flavor in a way that brings out both flavors. It is the kind of simple but classic combination that is immediately enjoyable but never gets old. If I haven't imposed this one on you before, do yourself a favor, and grab a six pack for yourself.