I think two Wrigley concessions serve food comparable to U.S. Cellular:
1. The grill on the outside patio of the upper deck, which serves brats, Italian sausages and Italian beefs. They're grilled right in front of you and you can add your own banana peppers, chopped tomatoes and giardiniera. Would I consider it good outside a stadium setting, no. But very passable ballpark fare, as good as most of what I've eaten at U.S. Cellular. There is a "premium" beer stand across the patio (Amstel Light, Beck's, three or four others).
2. The polish sausage/foot long hot dog stand near the Addison/Clark entrance. Both the polishes and dogs are grilled before your eyes and they accommodate requests for well done. Lots of toppings are available--grilled onions, sauerkraut, banana peppers, chili, cheese (sauce), etc. They do prewrap the polish, and possibly the dogs, but you can avoid those and the resulting gummy bread consistency by ordering at least one topping. When you do that, they take a fresh polish/dog off the grill and put it on a bun right in front of you. I have a friend who orders a topping to avoid the prewrap and then tosses the topping. (Requesting a polish/dog off the grill without a topping causes confusion and discussions about whether the prewrapped are "the same thing;" better to pay for the extra topping and dump it.)
The best part of the polish/foot long stand is the boat of french fries for $5.50. About double the amount of fries you get from those cups sitting for hours under the heat lamps at every other stand in the stadium. And I believe, though I've never ordered it, you can have unlimited toppings on the fries without any extra charge. If they're busy, and they always are for the first few innings, your fries will be delivered fresh from the fryer or with only a minimum stay under the heat lamps. Here's the weird thing though: there's no salt. Last year, there was garlic salt, which you could add yourself if you knew enough to ask for it. This year the garlic salt container is gone. I've asked about three times and each time was told it's because of the sodium (!!). Not one server related this information with a hint of irony. One worker told me there is no salt at Wrigley Field period. I am curious to know if anyone has information about this bizarre phenomenon. There is also a premium beer stand just east (in the right field direction) of this stand.
Anyway, I find both these stands serve decent ballpark food. Heck, sometimes I actually plan to eat at the stadium. I do not visit any other concession stand in the stadium except to get beer or peanuts.