i use creatine for a while now, works good for me
it's used in almost every sport today, it's not on the banned list
a steak has also creatine in it
everything can be bad for you if you use too much of it, even water can be bad if you drink too much of it.
true, it's mostly the water in your muscles that make them look bigger, but a muscle filled with water absorbs other things better also. (atleast that's what i've been told on a bodybuilding forum hehe)
I take 5 grams pure creatine a day, half before and half after the workout
just make sure you take it with enough water, and drink the creatine as soon as you do it in your water.
i mostly do it in my post workout shake (whey protein, dextrose + creatine)