Reading the menu carefully is a skill that many people have not mastered : "I had a lady order an open-faced sandwich once and when I brought it out she yelled at me because she couldn't pick it up to eat it because it was too messy... why would you get an open-faced sandwich then??" If your server specifically suggested you order something, then you can express your disappointment in a civil manner. But if you picked your meal, and you're not a big fan, remember that YOU made your choice, and also your server isn't the chef.