I just bought it last night since it was on sale for $5. I figured I'd get it since it was so cheap. I never really learned SC though, and the character I'm interested in playing is Lizardman. He takes forever to unlock though and I don't think I'm up to the challenge lol.
Free Step Dodge
Forlorn Penguin
Keved
I can vouch for that man. You have to beat every mission in Weapons Master including all the extra missions after you've beaten the mode once already. It is a mammoth time-scoffing effort to get him that's for sure.