Quote (Egonieser)
non-steam servers are so few, very glitchy and full of hackers, it has no features like rankings, unlocks, achievments, just raw and buggy gameplay, as non-steam users do not get any updates, they use the 1st release.
during the l4d demo didnt they tell and release all of this information like 1 week before it came out cause i remember it said hardly any cracked servers or copies right next to the download link