Mishima is usually played by one of two types of players - those that really enjoy the flavor of the army (imagine feudal Japan with sci-fi fluff), and those that want a challenge. Mishima is not easy to play. The mix of average ranged combat with good close combat makes it frustrating for people who do not know how to take advantage of terrain, nor who support their close combat troops while they maneuver to get into striking distance.
That said, there is a lot to like abot the corporation. There are many ways to get your troops to where you need them with a grunt para-deploy unit, impersonators that can be sprung from within the enemy's ranks, as well as some cool powers and really cool minis.
If you wish to play (or at least try) Mishima, I will contact my buddy, Marc, to e-mail you. He plays Mishima, exclusively, and has a lot of fun doing it.