I picked this up at launch, and so far I'm enjoying it a hell of a lot more than I did 3.
A lot of things seem more streamlined than before, including the story/events system, so it's not too hard to keep on the right track when going for one of the game's many endings.
I loved the first one, didn't play much of the second one, didn't think it was as good as the first one watched a friend play the third one and it looked good, but this one looks way better than 3. Just wish it wasn't $40. . .
If your issue with the price is paying $40 for a digital title, that is understandable, but as a game, Way of the Samurai 4 offers just as much, if not more than most titles which retail for $60.
If you're at all interested in the game and hate digital, the UK is getting a hard copy in October. I would say the game is well worth picking up if you're into genre.