Personally, I think McDonalds is McDonalds no matter where you are in the world. One difference I have noticed though is that the beef might taste a little different and from country to country there are usually items more appealing to the locals.
The atmosphere inside is always the same...families, teens, couples, and individuals.
Here in India a major difference is seen in the kitchen. Because there are vegetarian items on the menu the kitchen is divided into two sections. Vegetarianism is a part of the culture here and the menu at McDonalds is a reflection of that. There were no beef burgers available. Tom and I each chose chicken. Tom had a chicken masala sandwich and I choose the Spicy Chicken nuggets.
We don't have McDonalds in Belize or any other typical fast food place found in the states. So whenever we travel it's always fun to stop in and get a small taste of home. French fries are always on the menu and they rarely disappoint...I'm loving it!