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The quality of a season should probably be up-rated the younger a player is when having it...not sure to what level...my guess would be that you'd have to do some back-of-the-envelope math to determine how starting age correlated with average rookie OPS or somesuch and adjust your ratings accordingly.
Re: Game and Heredia and Haniger...
I think Heredia's rookie year was misleading...he got poor ratings because he played the last half of the season with a dislocated shoulder recurring regularly without telling anyone on the team about it, apparently.
But I definitely like Haniger over Gamel. :)