How much weight do you give a crime map?

[Chris Hewitt]

I'm looking at different properties in the St Louis area I keep finding deals in areas that on the trulia crime map is in the level 2/3 of the shading.  Listening to the podcasts, most guys say to stay away from the high crime (obviously), but what about the more moderate levels?  How much weight do you give that map on making an initial decision?