From what I read on the subject, honey has a medium/slow effect on blood sugar levels with a glycemic index of 55. This is lower than sugar, but otherwise honey is nutritionally the same. No fat or protein, all carbs...all of which are sugars. So I would be sparing with it, especially regarding the timing of when you eat it.
Aside from that I see no downside to honey mustard dressing. As for lowfat dressings, I would read the label closely. Make sure no high fructose corn syrup is present, and conisder the kcal count and macro breakdown. As long as you are active and getting a proper balance of macros and a proper number of kcals I would assume they are fine. But please note that is only an assumption.
Truthfully though, I prefer to stick with oil and vinegar/vinagerette myself.