Pacific Rim wasn't the greatest movie of all time but out of the summer flicks I saw (STID, MOS, WWZ, Oblivion and PR) it was probably my second favorite (the top three were all close in my mind).
That being said, I see it only making between $100-115 million domestically and $275-325 million overseas. Which isn't bad ($375-$440 million worldwide) but because of overseas gross receipts having a smaller portion going to the studio than in the US it will probably lose money before other rights are included. In the long run I think it turns a profit but not from box office revenue in relation to its budget.
Even if it made Transformers type money in China ($120 million) only a quarter of that would make it back to the studios.