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...a few points of correction...
1) Marcel does not ignore the bench...PINTO, when he calculates his RC for a team...only uses marcel scores for the starters...but Marcel rates every player for which there is enogh data.
Also, adjusting for playing time is done in Marcel by claculating average PT figures for the player the same way it calculates BA or OPS.  Go to fangraphs.com if you want to see an individual Marcel for any 2010 hitter...there are even Marcels off of MLEs for newbies.  But you'll see, for example, that Marcel ALWAYS underrates Ichiro, ALWAYS underestimates PT for guys who've had one injury in the last three years, etc.  They call it Marcel the Monkey because it's monkey stupid.  No thought required.  It works because most regular MLB players hit about the same year to year.  Marcel is, essentially, a benchmark that all other predictive tools have to prove they can beat by enough that they show real skill...it's like comparing the latest numerical weather prediction model to an old baseline forecasting tool like the Nested Grid Model.