I would get those tuna torpedos at Quiznos, until I found out they were one of, if not the worst choice on the menu. I thought I was getting something smart.
Would it effect my meal decision? Sometimes, but not always. I too would be more interested in the fat, particularly the saturated fat, plus the calories.
If 2 or 3 things sounded equally good to me, I'd get the one with the lowest fat/saturated fat, with total calories as a secondary consideration.
If however, I went to a restuarant because I had a craving for a particular item, then that is what I would get.
There was a time in my life that I probably would not have gotten the item I was realy wanting, settling for something else. Now, I've learned that it's better to get what you really really wanted, rather than thinking later on "I should have gotten that"