I think it was good to have some stuff from TSI, just to represent their whole catalgoue. I think Ain't It Fun by itself would've been fine
As for sympathy for the devil, i think its good they included it, as it would be hard to get hold of anywhere unless you buy the CD single from ebay or something (Like i did)
But not including Estranged just deserves a good smack!! It went to #16 on some charts, so why they didnt include it in place of another song (Since i dont have you perhaps, or live and let die) is beyond me