People wanted to see quicker releases from Valve...they got it...then others bitch. Valve can't win, no matter what they do.
Oh, come on - everyone was clearly referring to singleplayer content. With multiplayer games it's all about the community and releasing a sequel too soon can seriously damage a multiplayer game like L4D. It would be great if they could push out an episode for HL2 in less than a year but they haven't even announced anything about Ep3 - that's part of the reason why people are annoyed.
L4D2 has a ton of content and changes to it, and if people can't see that for themselves, no amount of debating will convince them of that.
No-one's doubting that and I think it looks quite interesting. However, Valve admitted that much of that content was originally aimed for L4D DLC, hence the controversy.
You can't just add a new boss infected here one at a time, or add a new weapon there. It would completely unbalance the games, the existing campaigns wouldn't properly support them without significant overhauls, and more. What they've shown for Left 4 Dead 2 so far would be IMPOSSIBLE to add as DLC for L4D in the same timeframe.
But look at all the changes made for TF2 that had required careful balancing - upgradeable dispensers / teleports, unlocks, gametypes, etc. Balancing 9 classes and all the possible interactions from each unlock is a lot more involved than simply slapping in another special infected and a more powerful gun to help dispatch it. And saying it's impossible is very different to what Valve said publicly, so your statement simply has no credibility.
@Dagok - You seem to think I have something against L4D2, or even L4D. I don't. I'm a little disappointed by the amount of support that L4D has seen - much less than CSS and TF2 - but it's still better than most games and it was solid on release. It hasn't held my attention and doesn't have much replayability anymore but I only picked it up because it was cheap... I was much more interested in TF2 and long before they announced the change in direction. L4D2 looks decent, especially some of the daylight levels, but I'm hoping they'll pull a special deal, like bundling it with Black Mesa Source (it's meant to be due 2009) or adding backward compatibility (something they've only suggested as a possibility, far far from a firm confirmation).
I just have doubts over the credibility of the statement made by Valve in this article (the "we didn't think to mention it") and have some criticisms I like to raise. This forum is meant to discuss games afterall and the L4D2 decision is CLEARLY controversial if Gabe has to address it in all the interviews he's done since. I still think that Valve is one of the best game developers / publishers out there, even if I have some serious criticism about certain business decisions.
"The price of freedom is eternal vigilance."