Whats is your take on the 50% rule when analyzing a property?

[Yasmani Delgado]

I see how this rule can be useful, but I think it can't be a deal breaker.  

One can make the argument that It is too conservative. It may only apply to home run investments. However, it may turn people off to nice investments that can give you anywhere between 12-15% ROI (singles, doubles, and triples.

I'm far from an expert and I want to learn different ways you guys analyze deals.