This game is good. That's my first impression. They really got the controls down. Pretty much the best controlling fps on a handheld.
Also played a bit of the campaign. This game is hard. I went in thinking that the game's campaign is structured like other cods, but it really isn't. Each operation is a score attack stage, tied together in a narrative. The goal is to maximise the score and make a perfect run. Each operation is 5 minutes long, but what they don't tell you is that there are no checkpoints within those 5 minutes. When you die, you replay the operation. And you die easily. I have been playing on hardened difficulty for 45 minutes, and I have not yet beaten the 2nd mission. Maybe I just suck. I wouldsay that this far so far is a purer shooting experience. The focus is on reaction, accuracy and speed. There are only 10 missions, but based on my skill level, considering how many times I died and retried, it will definitely take more than 2 hours to finish. Most likely 5 or 6 hours. I shudder to think how long it will take me on veteran.
Off to play some multi. Will be back again with impressions.