There's a pretty good review over at the Wargamer. While it doesn't pull punches with the game's flaws, overall it's a very positive review.

It's written by a guy whose opinion I generally respect when it comes to strategy games -- he too has been pushing me to try Paradox titles -- so when he says a game is good, I'm inclined to believe him. He's a pretty big fan of STW & MTW (for whatever it may be worth), and he's personally told me he feels the Takeda series is actually superior to Shogun in a number of ways. You don't get quite the same epic scale of battles as in the Total War series, but otherwise it sounds like the game does most things very well indeed. I'm hoping to pick it up later this year, once I've (hopefully) gotten through at least a couple more of my other games.