Do you ever get annoyed with Subway or do you love it? Why?

I never really understood the concept of Subway.
Every other fast food restaurant I go to has their menu options displayed above the counter and I just select the meal I would like and they make it, I eat it, end of story.
At Subway I see pictures of food on the wall and I go up to the counter and point to the sub, salad or whatever I see and say "I'll have that one please?"
The worker just looks at me with a blank stare as if they've never heard of it before.
He has a bun or a salad bowl in his hand and says "Tell me what you want?"
I point to the picture and say "Make that please, you know just like the picture?"
He just says "Tell me what you want on it?"
I say "How you made it in the picture looks good, just do that please?"
He repeats "What do you want?" Then he just starts putting a bunch of stuff in the salad bowl and it looks nothing like the picture and tastes terrible, LoL.
I always felt like if I knew how to make a good sub I would go home and make it.
Why would I go to out to eat and just design some half assed sub on the fly?
I feel like I have to do research before I can order food at Subway.
My ex wife used to always order it for me anytime we would eat there and whatever she selected was wonderful.
Now I go to Subway and I'm screwed!!!!