Enjoyed it. Pre-ordered Limited Edition so no encryption/pre-loading thingy for me. Quite enjoyed it so far. AI seems better, but need some more battles under my belt before a final verdict can be given.
Tried as Shimazu clan and got my ass handed to me, when the clan I beat up sought allies and got them. Still, played a few battles and it seems to me CA have reintroduced things from older TW titles, like pre-battle speeches. I also enjoyed the hell out of seeing the terrain resemble the campaign map area and the campaign map itself is beautiful and love the artistic style. Much more atmospheric game than previous titles and IMO only RTW and older TW games can compare with atmosphere.

Naval battles were boring though. Think those will get autoresolved.
Scored 3 achievements, 2 in one go even.

Although encountered a CTD doing beginner's naval tutorial, which never is fun.