Well I would give a 9. Back into my young years when I still had trouble with the Single Player episode I thought it was real hard. So together a real competition, something wich you wont get bored from. But now, its piece of a cake to complete the levels. Talking about the extra Multiplayer levels, I think theyre fine enough all. People back then didnt had such experience in level-designing, like 'What would people like playing'? Nowadays, we can discuss this on the forums and come together to the correct solution or just play some other home cooked levels and get some experience from. Back then, just one simple person made it and hoped people would like it. But still a 9 though!