Interesting thread. I've also wondered why Olive Garden seems to be backed most nights. We ate there recently because I had a gift certificate. The food wasn't horrible tasting but it was packed with preservatives or food additives (who knows what?!) and gave me a horrible tummy ache. I've had the same problem with Outback, Applebees and other chains in the past.
I guess I wouldn't mind chains if I thought they were serving healthy food.
Deb