Newsflash: Energy drinks are not good for you, either.
Generally, the ingestion of potent metabolic precursors at high levels when not sufficiently active to use them immediately in metabolic activity is... well, stupid. Mixing alcohol in just compounds the error. Unlike the Gatorade of my youth, which was essentially just water and electrolytes, new energy drinks actually contain substances that are absorbed and used directly in cellular metabolism. They're also combined with stimulants, like caffeine, in order to produce that psychological feeling of "energy." Trouble is, the body isn't designed to take boosts of those precursors directly except under very specific (read: flight/flight, short duration) circumstances.
Even someone at a peak level of activity in athletic exercise does not metabolize at a sufficiently high rate to necessitate the use of energy drinks. They're a sham, and a medically-dangerous one at that.
However, they're not being forced off the shelves by the FDA or Health Canada, so ultimately it's up to the individual to do their research and make an educated decision. Heh. Yeah, right. Who's buying the shots of vodka and Red Bull this weekend?