Batman is a close fourth, TDKR and Returns are tied for fifth.
In hindsight, need to know like 5-7 films for CW might have turned of some of the GA off, not to mention exchange rates. Still surprised CW did less than IM3, and BVS did less than $1B WW. However both did well at the box office and on home video. Both making good profits.
As for the DCEU, their next text is WW and JL despite my faith in both of them, if both have bad legs despite big OW, it could spell out a future problem. However with directors like Gibson, Wan, Whedon, McKay (LB director), there's still hope. Not to mention an $300M/$700M average is good consider the mixed reactions to their films.