To Kage Musha,
Bwah!
It's the same old tired response to any criticism you don't like. "If you can do better, go make your own map" and bullsh!t like that. It's tiring, pal. We're players, not mappers.
My opinion is that if one is going to make an effort to make one of these maps/campaigns, then they should take all criticism good and bad and use it to make their work better.
This particular campaign could've been a good one. I actually liked most of it. The ending is near impossible and there's people out there that play L4D that aren't expert players like you.
Now, come up with a better response than telling me i should go make my own campaign. Stuff it, pal. There's TONS of epic win to play on L4D by authors that actually finish what they star and actually try to improve their work.