I haven't ordered off a children's menu since I was, oh, 8 or so.
My main problem with children's menus is that they often consist of hamburgers, hot dogs, chicken fingers, and similar drivel - regardless of the restaurant's stated cuisine. A couple of weeks ago, my husband and I were in town looking for a place to eat lunch. We found an Indian restaurant and started reading the menu. Chicken tikka masala, lamb vindaloo, saag paneer, biryani, samosas, dhal, naan, etc. - all kinds of good things. Then my eye fell on the children's menu. All children's meals are served with french fries. You can get chicken nuggets, mozzarella sticks, fish sticks, or just the fries. Uh, what's the point of going to an Indian restaurant just to get fish sticks and fries??
Usually, if I'm not all that hungry, I'll order an appetizer, soup, or salad, or I'll order a main course, eat what I want, and take the rest home.