Left 4 Dead

Let's put it this way. It's something like a zombie mod on the Source engine. I really enjoyed the game. Great graphics, physics, and excellent gameplay. There's a strong emphasis on teamwork, which is sure to be appealing. I also like that there aren't tons of weapons, just a few types, but when you play, it doesn't feel like there are too few, although maybe adding a couple more guns would be good.
Am I the only one who has played this?

yes, for now...

a friend of mine wants to buy it and is encouraging me to do the same, so we can play together online... maybe we'll also get my brother or someone else involved.
Basically, I'm not really eager to buy it (maybe because I don't have the money... or maybe because I don't know how to connect everything via the internet and so on... although it seems like it works through Steam, anyway, I'll look into it), but I've seen the game and it seems suitable for online play (but I'm unlikely to play it alone)... so, maybe in the near future I will.

I won't be able to play until after January 16th.

Yes, the game isn't bad; I played the demo as a survivor. And it leaves you with some special feelings, whether it's due to the high-quality animation and sound, or simply the atmosphere, but before I played, I thought the game was weak. From the outside, it looks unappealing, and I didn't like the concept, but when you survive the first wave of zombies, you realize that the game is actually great.

The only thing I didn't like was that, although interaction between players is really important, it's mainly between human players, and the in-game characters don't really interact with each other. I mean, for example, when someone helps another player up, and the other shoots, or when one player puts a machine gun on another's shoulder, which is common in other cooperative shooters, it's practically not used here. There is healing of wounded players, sometimes you need to help a teammate who is stuck on a cliff, and that's almost it. For such a game, that's not enough.

Well, I don't know. This game evoked the best feelings in me. I can't really imagine what else could be added in terms of mutual assistance.