While considering prospect keepers, one of the problems I have been having is what to take into account more. On the one hand, prospects who get to the majors tend to have a large amount of minor league at-bats, so I think that those numbers should be taken into account. Then, one can take into account prospect pundits (be it Goldstein or Callis or Sickels or whoever). Then there are the major league numbers. How much do those play in? I know the sample-size is much smaller than the minor league numbers, and that players do need adjustment time, but some of the major league numbers of prospects scare me.
Guys like Andy Marte, Tulowitzki, Iannetta, and even to an extent Carlos Quentin have not hit in the majors like their minor league numbers (and position in prospect rankings) would suggest that they can. How much does this play in?