I've written two dining reviews and take pictures of the meals of all the people in my party, for TS, CS, and snacks. I've never had anyone stare at me, make funny comments, laugh, anything of the sort. I think most people are so wrapped up in their own vacation that they really don't pay attention to who's taking pictures of what.
If you think you'll enjoy writing a dining review, do it! Who cares if someone thinks you're weird? Last trip I brought a little notebook to take notes about my food in, and I'll be doing the same this trip.