Me and a friend take the stance that coffee is generally "good". My other roommate says that it's generally "bad".
But from the research I've done and my friend, we've both agree that coffee has benefits such as possibly reducing risk of type II diabetes, promotes more intense workouts, possibly augments weight loss.
Bad things about coffee I've read are that it can increase homocysteine levels in the blood and possibly raise cholesterol...also a diuretic, and possibly strains your digestive system, but in reality that's if you're consuming excessive amounts.
(I just tried french press coffee, which is hands down superior in taste)