I don't order the cocktails much at the machines in Vegas because they're so weak. I'm not a big drinker anyway so I'm perfectly happy with a soda.
The Irish coffees are usually pretty good but I only drink those in the morning. I've also gotten decent bloody marys, but with those you hardly get any drink because the glasses are so small but at least at Caesars they come with olives and such so it's a snack too.