My mates got the pc version, and its the crap version.
You can't swing from any building you like, you have to shoot your web to designated little web pictures in the sky and swing from them. The fighting is extremely simple, and you get no slow mo spider sense fighting either.
Sorry, but if your wanting to play the adult version, you'll have to buy a console. (you can pick up a gamecube for £40 these days, so its not that expensive to get one) You could still buy the pc version, but i think you'll find yourself being highly dissapointed.