I agree and don't use those deals. The items or sizes are wrong. I'm always offered "20% off purchases of $10 or more", "$2 any size fries", "$0.29 any size soft drink / tea with minimum spend of $3" which I think are pretty decent and always a savings.

If I do eat McDonalds its usually just a burger + fry + drink usually around ~$6ish unless I'm ordering for others.