Just to throw my two cents in here, I was incredibly psyched for L.A. Noire. I'm a huge fan of the Noir genre, and when I heard that Rockstar was making what seemed like a GTA sandbox style game where you played a detective in the 1940's, I damn near had to change my pants.
The game was one of the reasons I even bought a PS3 (it was going to be a PS3 exclusive when I first heard about it, shows how long ago it was) and my reason for not buying it now isn't because the game lacks some feature, but merely because...well...it costs money. I'll probably pick it up sometime next year when it's gonna be 19.95 at wal-mart (I'm being hyperbolic, but you know the game is gonna drop in price)
To be honest, I didn't know that the game lost its sandbox style gameplay until I clicked on this very topic, and I'm not gonna lie...that is a bit of a bummer for me. But that alone is hardly going to make me change my mind about the game itself.
If you were excited for the game, and then decided to pass on it because it doesn't have multi-player or whatever minor reason you may have, guess what? You probably didn't want it all that badly to begin with.
Your reason for wanting it may be different than mine, but if you're a fan of the Noir genre, or even just a fan of Rockstar games, the real question is why WOULDN'T you still buy it?
In my opinion you should either have a well thought out, personally justified reason for buying it that doesn't simply involve complaining. But of course...this IS the internet...