Massive intervention. Massive expenditures. A massive anti-gun campaign. The massive bill. Everything is "massive" these days (those examples were all from one recent edition of the Washington Post). I'm not going to hit you with a geeky copy-editor rule that says "massive" means only "having great mass." Common sense and Webster's New World tell us it can also mean "larger or greater than normal," "large and imposing or impressive" or "of considerable magnitude."
My problem is that the word has become a cliche. Writers seldom opt for "huge" or "extensive" or any other word when "massive" is an option, and, as when any quirky fashion choice becomes the standard (see mid-1970s ties and lapels), it looks silly. When there's an unfortunate double meaning (a massive campaign against obesity), it looks even sillier.