Buy and Holds in areas with lots of rentals?

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Hi everyone,

I've been looking at markets close to me over the past few weeks.  One thing that I can't get a good read on is whether lots of rentals in an area is a good or bad thing for me as an investor.  On the one hand, it shows that the market is there, but on the other hand, a lot of the times that means more crime in an area.  

I know that each area is different and it's impossible to isolate one factor.  Generally speaking, what do you all think about towns / cities with lots of or very few rentals?