Call of Duty:WW is a great game.
The weapons are very balanced, each weapon has it's power and weakness. The sniper is easy to use and the bolt-action rifles are good for long-range only. The variety of grenades are pretty good, they have added a Flare, which is where you can light up a whole section of a night-time map and give the location away of the enemy. The frags seem to have a less damage radius and the molotov cocktails are deadly.
The vehicles seem pretty useless to me, there is only one map in the Beta you can use a vehicle (tank). It's hard to control and when you're in it, you practically have a target on your head the whole time. You can always see where the tank is on your radar, so when you're in the tank, it's hard to find someone, because everyone hides (unless they have an Rockets). The tanks are fun, but if your want fast kills without driving around for five minutes, I wouldn't recommend getting into one.
The kill streaks are good too, here's a breakdown of them
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3 Kill Streak - Plane Radar - Same as CoD4
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5 Kill Streak - Artillery Strike - These are much different, they have the same radius as CoD4, but they are three times longer and louder.
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7 Kill Streak - Dogs - This is so much fun, the first time I had this, I got an extra 12 kills, these dogs do the job. The dogs come out of the side of the map an attack the enemy only. There are two ways to kill a dog; shoot and knife. The dogs kill you the same way as CoD4, except all they have to do is hit you once and your dead.
The maps are very detailed and think they're great.
Makin: My favorite map, I usually get 200-300 points on this map every game. It's the small map in the beta and it has different variation all through the map; one half is maze-like and the other half is open with many buildings to protect you from a surprising air-strike. It's a night-time map, which really does affect seeing someone instantly, the players really blend in with the environment.
Castle: This is a also a great map. It's the medium sized map in the beta. It's mostly like a "protect the high ground" map with many open areas and trenches. There are about three entrances to every building, so if you're planning to get countless sniper sprees on one spot, I wouldn't count on it.
Roundhouse: This is a great map for snipers and bolt-action guns. It's the large map in the beta. It has many high sniper spots and this is the map with the two tanks.
Capture the Flag and War are the two new gametypes that were not in CoD4. War is a great gametype that can last pretty long and it' my favorite gametype in the beta. CTF is standard CTF, there is a flag at each base, and you must grab the flag and bring it to your base. Team Deathmatch, Free-for-all and Mercenary Team Deathmatch also made a return in the beta.
The spawn points are annoying, sometimes, it will bring you in the middle of the fight and by time you know where you are, you're dead.
The perks and barracks are much like CoD4, but with some differences. It has new and different perks, one for example is where you can revive your teammate if he is in Last Stand mode and many others.
Halo 3: ODST + Forza Motorsport 3 + Modern Warfare 2 + Left 4 Dead 2
= End of social life