Wow, a lot of debate about this announcement at E3. The first Left 4 Dead has been out for a year, so it’s really unusual for Valve to announce a second one, especially since Valve are known to take their time with new releases and make sure it’s the best thing possible.
I only played the demo for L4D, but it was very enjoyable. From what I’ve heard, the second one adds new stuff, but isn’t a significant jump to justify a full retail title, and it would have been better to just release DLCs instead. A lot of fans are apparently boycotting L4D2 because they feel that the release of a second game, which isn’t a major release from the first, will split the online community in two and result in poor online play. I see their point with this, and have to say I kinda side with them a bit, not sure about the boycotting part though.
L4D2 mainly adds melee weapons, such as axes to the gameplay. That was asked for a lot in the first game, but besides that, and incendiary fire rounds, there isn’t a lot of difference between the first and second. Valve have stated though that there will be a bit more emphasis on story, with the player possibly finding out how the zombie infestation came about in the first place.
Regardless, I know Valve will put out a L4D2 that will be enjoyable. I am a bit disappointed that it is so soon though, about the end of this year. I think it would have been better to release the content of this game as a DLC for the first, and then package a new edition of the game with the original and all the DLC combined for a new retail package.