Salisburry steak, meatloaf, mac and cheese, Stoufer's lasagna, some pot pies are pretty good. Ready made Asian dinners are also usually good, things like orange chicken, General Tso's chicken, shrimp dishes, pot stickers, all good. Beef and gravy is good as well. Many Mexican offerings are pretty tasty.
Of course some brands are better than others. Amy's, Stoufers, Swanson, Marie Callendar's are some worth eating. I tend to prefer breaded, grilled, or baked fish to battered fish offerings. Not a tv dinner, but Stag brand chili is about the best canned chilli IMHO. And I prefer VanCamps pork & beans, or Bush's original, as they are easy to doctor. I don't care for store bought egg rools, as they are full of mushy cabbage.
Well, that should be enough to get you started.
Seeeeya; Chief Longwind of the North