There's definitely a BOGO in the ACG - don't recall whether there is in the MRB. If you're not already a member of their slot club, I think they give you a BOGO when you join.
I've stayed at the 4Q several times over the years, so I've eaten there a lot. The only thing I ever ordered that wasn't particularly good was the broiled seafood platter. Wasn't bad - just not particularly good. The sandwiches are good and I really like the pizza, especially the deep-dish pizza. If you get an entree and it comes with soup or salad, both the gumbo and the Portuguese bean soup were really good.
I'd skip the carrots that come with most of the entrees. They're pretty much always over-cooked. Other veggies are usually good.
Breakfast there is really good,especially the chicken-fried steak, with apologies to my cardiologist. The regular steak and eggs special is good, too.
And yeah, I'd put it a notch below 777, especially if you don't have a coupon. But I don't think you'll go wrong eating there.