Plasma Sword (a.k.a. Star Gladiator 2) is a fun 3D fighter from Capcom. You choose from humanoids, mechs, robots, etc to begin the fighting. Many of the 24 characters are the same as the first Star Gladiator if you happen to be familiar with that game. If not, no big deal, just jump into the action. As with many Capcom games, there are lots of special & double-dog-super-uber-duper moves.
The controls start out simple. Everyone has a weapon. The first two buttons are for different attacks with that weapon and the third button is for a kick. The last button is for stepping in/out and otherwise as we are playing in 3D. Of course, the joystick controls where you move in the ring and how you complete all the special moves.
The graphics are a little chunky, but overall very enjoyable. Specifically, the animations are very creative and many of the attacks made me laugh the first time I saw them.
As I have written here before, I am NOT, by any means, an expert or even very accomplished at fighting games. Therefore, my analysis of them is very superficial and based primarily on the look and feel of the graphics, and the feel and variety of the controls and moves. I have not played enough to discuss the depth of the characters individual attributes or a lot about defensive/counter moves at higher levels.
If you'd like many more details about the games characters and controls, there is a very nice article on Wikipedia here.