re: Left 4 Dead 2 - it's so good

Just played through the first two campaign's, and one thing that really stood out was that it was a lot harder, even on normal, an so a lot more fun. Instead of just moving from corner to corner, you're pretty much scrambling the entire time.

The new weapons and power ups are a lot of fun, and the level design is great. And the new special infected fill in the gaps that the old ones left nicely.