That sounds like a bad situation, but definitely take it as a lesson learned.
When investing in homes like this, what is your end game? Do you think that one day income from properties like this will provide you with retirement income? Are you expecting appreciation?
From the sounds of it, you're getting a cheapo property in a poor area whose best years are far behind it. If you're not a fix and flipper and you are investing to accumulate cash flow, this is what you have to consider:
-Is the income going to be reliable? In a crummy area with a horrible economic outlook, the answer is probably no. You're guess is as good as mine but I wouldn't bet on it.
-Are you going to be increasing your net worth? Cheap properties like this don't take advantage of financing and a corresponding gradual increase in equity. With financing, even if you assume no appreciation in the value of your investment property, you'll still increase your net worth paying down your property. Paying cash, your equity increase is tied exclusively to the market (which doesn't look good).
If you're looking for a reliable stream of income, I wouldn't invest in crappy properties in bad areas with dim futures. If you want to pick up a cheap place for the educational experience, then by all means take it as that-- an educational experience. I would save up your capital to purchase quality over quantity. It will benefit you now and in the future.