Why is the Immortal Game so popular?

I've just analyzed this particular match, called the Immortal Game. Looks like any other game to me, I don't see anything special in it, but I know it's considered one of the best games in history.

Can someone please explain me why? I don't see anything legendary in it, but that's probably because I've just learned playing chess and can't tell the difference from a clever game to an ordinary game.

Thank you very much.

Source: 

http://en.wikipedia.org/wiki/Immortal_Game

http://www.chessgames.com/perl/chessgame?gid=1018910

Yeah I know that those moves are pretty bold and clever, but I thought were just ordinary sacrifices for pro players. Hence I'm kinda suprised this game is considered ''immortal''.