It's not normal Risk. Not by a long shot. There's all sorts of extra rules, accounting for good and evil armies, there are quests, and you have to -- in addition to the normal wars of expansion and attrition -- worry about keeping the One Ring and the Fellowship out of the hands of evil armies; if they successfully find the Ring, then the game immediately ends and evil wins. It's rather more complex than Risk.
It's a little confusing at first, especially when you've not played Risk in years. But after a while, you get kinda into it. There was a bit of glee involved in the men of Gondor and Rohan taking Fangorn (and Isengard), and taking Minas Morgul. And I swear my one teensy elvish archer who was defending Rivendell after all other forces had fallen must've been Legolas; he took out something like five or six attacking armies before he finally fell!