He's generously listed at 5'10" and 198 lbs. He's probably closer to 5'8"/5'9", and probably closer to 185 lbs.
History's shown that short pitchers don't make much of a long splash in the MLB as starters. They do, however, perform well as relievers. Cueto could very well be our next Jared Burton, and once the Reds are rid of David Weathers (via trade or letting him walk), replace Weathers.