The Ocean's movies for me has always been how cool and charismatic the leading actor (Ocean) comes across. Sandra for me did not display her lineage of coolness like her brother(s). I don't think she has it in her, but there are plenty of other female actors that could pull it off. Jada plays one on Gotham, Charlize has great range, Sigourney would have been awesome, and possible Halle.
Yes, the heist was well played, except for the obvious reverse pickpocket.