Zagat (whose review policy is at best sketchy but we digress) reviews places all over the spectrum (the Michelin Guide doesn't and won't, but they grade food, service, and a host of other things- it is the gold standard for reviews).
Beyond that, Eater has numerous outlets in most North American cities and their "best of" lists are, for the most part, spot-on (for my home city BlogTO has a ton of "best of" for pretty much everything (they nailed pho and their pizza list is pretty accurate)).
Hate to tell you this, but what you call 'regular food' got its roots from either China, France or Italy. Meatloaf? That's taking the tough nasty bits, grinding them up and adding something to give it flavour. Casserole? That's French cassoulet, which has been around for a few thousand years or so. Burger? Take something tough and make it edible.
If you're in New York (I'm there a few times a year for work), you CAN eat well and not feel out of place. Start with Katz' Deli. Best freaking pastrami sandwich you will ever eat. Period. Every time I think our smoked meat sandwiches are pretty good I'll have a Katz' sandwich and think otherwise.
They have their own kind of pizza- how 'regular' do you want to get? Lombardi's or DiFara's are my favourites. Fried chicken has become popular; Yardbird just opened a location. Christ it's Fried Chicken! Hell, if you want to be a bit hip look for Nashville style Hot Chicken! There's about a million Italian places; just go to Little Italy and spin the wheel. You can spend a bit and go to Rao's but you don't have to. Burgers? Shake Shack came from New York! If you want to spend 30 bucks on a burger, go to Minetta Tavern (you'll thank me).