Clearly, what feels good and bad to a
person can't be a reliable indicator
for decisions;
I'm going to disagree slightly with this statement of yours, Vesuvius...but only by 100% ;)
Emotions are a completely reliable form of decision-making tool. The problem is that most people don't know how to use them in that way.
I could go on at extreme length about this subject but then no-one would read my answer so I'll cut to the chase and provide the golden rule...
If you act upon thoughts that come to you while you are feeling bad, it will lead to more situations that make you feel bad.
If you act upon thoughts that come to you while you are feeling good, it will lead to more situations that make you feel good.
If you think about this in regard to past situations in your life, you'll see the validity of it. It's just the Law of Attraction in operation in the moment.
So, the bottom line for reliable decision-making is to avoid acting on impulses that come to you while you are not feeling happy.
Allow yourself time to find your center again before making decisions and acting upon them - and the actions you take will then be very different ones to the ones you would take when upset.
So to answer your question, I think emotion and intuition do get confused because I think they are intrinsically linked in the manner described above.