Holy shit, this could very well be the definitive Musou. It has DW's tactical edge, the fast pace of DWG3, lots of funny writing, a (surprisingly) interesting story - especially if you know the characters backgrounds, and the character leveling system from past Orochi games makes it as fun as ever. There's tons of stuff to unlock, and every time I play a map, I'm finding a new move or something added to my move list or a new and cool way to pull a 1000 hit combo.
Speaking of maps, it's so refreshing to have multiple armies fighting each other. My favorite map so far was a struggle between three (not two!) factions forcing my own army to split up. I'd go back and forth on the front to handle any incoming threats. I tried the map on hard and it was balls to the wall tension that felt like a real time strategy game with back and slash added in. Holy fuck.
I'm really enjoying the new special attributes they gave each unit type as well. Stringing combos as a Wonder character never ceases to be fun.
It doesn't have the difficulty curve WO2 had but aside from that this game is Beat em Up crack. If people gave this game a shot it could easily be recognized as being one of the best beat em ups the genre has to offer.