If the guy is direct and has a positive attitude I say no but I take it as a compliment. It's like a feather in my cap (someone thinks I look good!). If the guy is being weird and indirect about it that gets creepy (and sometimes a little scary). The difference is that the positive guy usually takes the hint if I'm not interested. If they don't take the hint they BECOME creepy. The creepy guy is either so indirect that there's no clear way to give a hint, or just refuses to take the hint at all.
As I said before, since I'm straight this isn't about whether I'm attracted to the person or not. It's about someone acting in a way that feels creepy or not. It's about whether boundaries are being crossed. Finally, I'll end by saying that you can be hit on by a good looking person in a creepy way, and flirted with by an ugly person in a very positive way. It's all about attitude.