Everything at arbys is delicious imo. My favorites are the french dips, the regular roast beefs, and the beef and cheddars but the thing everyone is really missing out on are the jalepeno poppers. They are great. Their new burger is a winner as well.
Also, while prices seem to have gone up pretty much at every restaurant arbys seems to not have raised their prices. 4 roast beefs for 10 bucks is a steal. french dips for 6 bucks is a steal. 2 Cheddar ranch chicken sandwiches for 6 bucks is a steal. And that their everyday all day prices (i think the beef and cheddars you speak of are 2 for 5 bucks which is also a steal.)
Plus they got the best coupons in the business. And they even finally switched from pepsi to coke which is a bonus though I typically dont get a soda.
I bet ainge has something to do with it all.