Molotovs were not a skill/ability last I heard.
As I say, i may have been wrong about some things there, however - http://www.facebook.com/photo.php?fbid=10150157286544843&set=a.10150149447139843.310536.94712919842&type=1&theater that picture there does show a molotov in the skills menu, and in a video ive seen when a molotov was thrown the player lost one blip of supply or power. I was just assuming, is that an instant unlock or something ye?
Either way, I still dont think getting a knock down from a molotov is cheap.