Detroit house $50k

[Scott Walker]

I'm from Houston and im just getting into REI. I was thinking about getting into the Detroit market and i talked to a real estate agent and he said the houses that are real cheap are a bad investment and he told me he found a house for $50k on the nicer side of Detroit with a tenant in it renting for $900 a month. But i see houses saling for 2 and 3 thousand dollars what is the better way to go?