It took me forever to get my copy as well. But here's my initial impressions.

I was very unimpressed with the AI in smaller battles (my first 3 or so were fought with a few units of Yari Ashigaru, an archer, and a cavalry unit on each side. During all three battles I managed to lure their general from behind his lines with my flanking cavalry and as soon as he started charging I beat a hasty retreat behind my lines where I was able to swamp him with spearmen before he could get away. Suicidal generals appear to be back.

A few hours later I was quite impressed with a large battle in a mostly forested area where the AI managed to pull some stealthy attacks to weak points in my line. I managed to drive them off but just barely and my archers were a little worse for the wear.

Multiplayer was fun though. I managed to get a few games in before real life took me away from my bliss. So far everyone seems quite friendly and it looks like this will be quite an enjoyable experience for at least several months to come!

As for the campaign itself, once I installed it on my desktop (my laptop's graphics card is awful) I was quite impressed with the atmosphere, simplicity and beauty of the game. Hands down, the best preorder I've ever made.