Another game, another "network" requiring a login.
I've got Steam. I log in to Steam. I trust Valve to keep my credentials safe. You guys, don't take this wrong, but not so much.
Even viewing this with the best of intentions, where said account is only used to keep character growth, win stats, blah blah blah, you should look into some sort of automatic account creation/login for Steam users. And most companies don't have the best of intentions, using account info to send me more spam, or worse.
Note: I rage just as much when EA or bioware pulls this crap with Games for Windows or Bio-net (or whatever it's called). This isn't me picking on a little guy. This IS however me walking away without even considering your product because the demo requires this.