[mosdef]

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couldnt agree more, leadoff hitters shud have an obp of at least 350 imo.

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It doesn't work that way - you need to choose from among the players you have, you don't get to choose the players you want for each spot in the order. What if your only guy with .350 OBP is also the only guy with .500 slugging %s and you have an arbitrary "rule" that your leadoff guy must have an OBP of .350 and your cleanup hitter must have a .500 slugging?

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Same thing with jimmy rollins, his obp was only like 330-340 but he hits so many home runs, hed def be more effective further down the lineup.

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Why do you say this with no justification? If you replace him at the top of the order with someone with higher OBP and lower HR, you have:

- a net LOSS of expected HRs hit by the lineup; plus
- a net GAIN due to Rollins having (presumably) more opportunities to be a good hitter with runners on base

Observing the gain in the second bullet point without developing an argument that it exceeds the loss in the first bullet point doesn't allow to draw the conclusion you are drawing.