As it happens, last session I played Reign, I have been faced with the disadvantages of the one-roll chargen: My character simply sucks at everything, sad fact. I like him, but his stats are crap. He's got a little bit of everything and too much of stuff you rarely need. And even with that stuff, like "plead", he's at 6 dice max which still doesn't make for a very good chance of even rolling a set at all, let alone a better set than the other guy. And he really sucks at anything that has to do with fighting, which is not going to improve fast. But Reign's a lot about fighting.