Oh God yes the level of variation between supermarket chains in the US is really shocking. This is something you have to learn if you come here: what chains you have and which ones are good for what things. UK supermarkets are not always amazing but they are more consistent. The mid-market US chains (think the ones owned by Kroger, which owns about a dozen different names now, Safeway-Albertsons, and Ahold Delhaize) are what I call "aggressively mediocre." Nothing is bad, but mostly, not very good, either, though the local Kroger formats vary from area to area. Now, if I go to Wegmans, they take a lot more pride in the fresh food, the cheese, prepared products. H-Mart (Korean chain) has an amazing produce department (good prices too) and a fabulous fish counter. If you want really good fruit, you need to buy it fresh from a farmer's market or stand, unless it's something that ships very well like apples and citrus.
Also, I might have said this on this or another thread, but the US has a lot of recipes that were concocted by companies in the 1950s and 1960s to sell products. They have stuck around to varying degrees. The Midwest is supposedly the capital of this kind of food. A lot of people do mix things up. For example, making a pot roast from scratch but using a seasoning packet.
Even something like pasta sauce: You can buy Prego, which is pretty blah and has sugar in it, or you can spend 2x as much on Rao's, which is on a par with homemade. (Except for jarred Alfredo, which is vile from any brand.)
Beef: I've had delicious beef in the US and mediocre, I think again the variety is huge. There's also lots of choice if you go to the right stores. Think being able to choose between grass or grain fed as well as grade of beef. I don't eat pork but I hear more complaints about that because during the whole low fat craze they bred lean pigs and labelled it "the other white meat". My friends who like pork say if you want juicy chops or roasts you have to buy heirloom pork. American lamb is actually delicious but can be hard to find, it's not as popular and cheaper Australian imports push it off the shelves.
Earning potential depends substantially on job and location.