There's really no better way to describe him. He's big, deals a lot of close-quarters damage and is the primary subject of this new Darkspore video. Listen, if you dare, to some very dry narration of his assorted powers along with gameplay footage of the brute in action.
If you start the video and fear you cannot finish it, I'd still encourage you to hop to about 1:35. Here they show how Zrin and another character's squad powers can be combined for some useful effects. Nothing too terribly deep but should probably make for some fun.