I think the big selling point for the Foreman Grill is that it reduces the fat content of meat, so it will likely yield a dryer meat since it drains the fat. The only thing I use mine for is the occasional hamburger and for panini-like grilled sandwiches. Chicken was awful on it, and NEVER grill a steak on it. I had a roommate do that once and you'd have a tastier meal by just eating the cash that you were going to spend on the steaks :-)
Experiment with vegetables and sandwiches. It really does make a nice, melty grilled sandwich.