Single Player:
I've played a few levels of the SP and I have to say I'm quite impressed. The story is justbetter than MW2's and seems more believable. Well, I suppose you could put that down to the Cold War being the inspiration, which is great as the Cold War is an interesting time. Hardened should probably be the default setting for experienced CoD players if you want a challenge. Go Veteran if you want high blood pressure. There are a couple of bits where your left to work out what you need to do but I reckon that adds to the game, as no one is holding your hand. Stressful, yes. More rewarding? yes.
Multiplayer:
No doubt that this is where the comparisions will be made/
Better than MW2? In my opinion, yes. As well as the traditional game modes there are also wager matches. In this you bet your CoD Points (points you earn during online play) in 4 different modes. These being:
Sharpshooter - In this you get given a random gun but the twist is that every 45 seconds your weapon will switch to something else. Keeps a level playing field.
Sticks and Stones - A crossbow, a ballistic knife and a combat knife. Those are the only weapons avaliable to you for this game mode.
One in the Chamber - One bullet, 3 lives. You have a pistol and your knife. You only have one bullet per life.
Gun game - Start with a basic gun, earn killstreaks to get better guns.
Plus, add in the fully customisable emblems and a set of maps that are well designed, you will get hours of enjoyment. Also, bored of the in game challenges? Buy a contract and set your own challenge.
The multiplayer in Black Ops offers a lot more and helps you keep the game varied and with the added bonus of letting you add a personal touch to your emblem and your guns, Black Ops just caters to a wide audience. I spent ages trying to come up with my emblem and I will continue doing so.
All in all Black Ops just offers a better all round experience and Treyarch have a done a bang up job.