Just play whats fun yo, I remember reading carry was bad for beginners, but I only have fun with carry style characters/gankers though. I think that reasoning comes from the fact that carries are mostly weaker than the others in the early game, and quite a few noobs have a tendency to go rambo at towers within like 2 minutes into the game. And carries need to last hit a lot more than the others.
it's pretty funny when they rambo into me right at the start and i draw them into towers and use imba stun T_T. And I'm pretty shit, but I do end up with highest gold/min and exp/min in a lot of my noob games despite not usually having the best kill/death ratio.
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