To me it doesn't deserve it. The game recycled to much from the first game.
From the mobs, to the sounds, to the bosses, and even animations. It really feels like SMG1.5 with updated graphics and new levels. Best way to describe it is a expansion pack.
THIS IS NOT A TROLL. That is just how I feel. It doesn't make the game bad. But it doesn't deserve a 10. A 9/10 is more like it.