What do you mean by 'OK?' Do you mean financially OK? US Airways' financial problems are systemic and date back to decisions made over a 30-year period. Decisions which have nothing to do with the A330. Probably the biggest factor is the cowardice and/or complacency of CEO's Edwin Colodny and Seth Schofield. They failed to engage unions over excessively high-cost labor agreements, and failed to rationalize the fleet after the 1987 airline buying binge (PS and PI).
Indeed, sadly, the very existence of the airline could be called a financial problem. Its constituent parts (Allegheny, Mohawk, Empire-Piedmont) went un-bought by the network carriers over the years, because they didn't want medium-size Northeastern routes. Easier money was to be made elsewhere.
From what I have read, an aircraft of the A330's size was well-justified for certain transatlantic routes, when US made the decision to purchase them. Excatly how well the routes are doing with A330's now, I don't know, but I haven't read anything to suggest that the routes are failing badly. US has maintained the bulk of its European routes, and use of A330's, since 9/11.
Need a new airline paint scheme? Better call Saul! (Bass that is)