Samurai Shodown has always stood in contrast to other fighting games and Sen continues that tradition. It's a game that wants to form its own unique identity, which is great in theory. Unfortunately a strong sense of identity is the only thing Sen does well. There's a nice sense of human weight and momentum to the animations, but many of the attacks appear frustratingly similar, which muddles the intricacies of combat.
Basic attacks come with a high penalty for failure that encourages defensive play. Lots of slow, uninterruptible attacks, haphazard balance, and an ineffective sidestep make for a fighting experience that never really works, despite some of its nice ideas. There's no particularly good reason to invest time in this game when there are so many better fighters on the market.