Let me start by saying
I LOVE LEFT 4 DEAD 2. I had no problem paying 50 bucks for it (Suck it 360 players, oh and you aren't very good teammates). I play it a lot
1. No achievements for old things.
There are no achievements for doing anything that can be done in the first L4D. Go ahead, look. http://www.xbox360achievements.org/game/left-4-dead-2/achievements/ The only special infected achievements are those for the new specials. The only thing that was even close is "In a Versus round, leave the saferoom to defibrillate a dead teammate." but even that is defibing a teammate and not just saving them. Most of the time sequels have at least some sort of repeat achievements. They don't even have the "Kill **,*** zombies" or a variation on that. Most sequels will have something that builds off previous achievements such as Gears of War 2's active reload achievement or the better example of Seriously 2.0
2.The old special infected look fairly similar still.
Sure, there is now a female boomer for no apparent reason and the smoker has cancer and the hunter is sleeveless but generally speaking, they are the same. They have 1 or 2 things different but all look very similar still. The blur when the hunter pounces is nifty looking though.
3. On the PC, both install as 1 game.
You can look at this yourself too. Go into your control panel and click to uninstall programs. Look for Left 4 Dead 2. It doesn't exist. In fact, there is only 1 L4D entry and it says "Left 4 Dead" and it's 5.11 Gigs with both installed. Now maybe this means that L4D2 just doesn't show up on that list, but that smells awfully fishy to me.
Ok, like I said, I LOVE Left 4 Dead 2. This isn't complaining. The new campaigns are fantastic (damn you Doctor Who for making me use that word so often) and scavenge mode is the perfect little pick me up if you don't have 2 hours to play. These are just things I saw and was suspicious about.
2- The Smoker has a completely different strategy, a shorter range but quicker "reload"; the Hunter now does more damage, changing his strategy too, he's no a pawn anymore; the Boomer is the only one that's still the same, but "he" gained a completely different model...
3- Like all Valve games ever?
Fuck you too bro.
Besides most people that it on the 360 play with other Dtoiders, you know, friends?
I would love to play against you in versus, with my shitty 360 playin'ass. LOVE IT.
Also, who gives a shit.
Also, what de Bloo said.
Oh, and I don't think everyone should be given a mic on LIVE, it's full of douche bags that just complain and make fun of people. Not exactly conducive to a game like this.