In a "regular" sale you are negotiating with the person(s) who lived in the property and often they will adjust the purchase prices based on or take liability for the condition of the property.
If you are being advised not to buy the property it may mean the condition isn't good which could make it impossible to get financing.
This has become commonplace with bank owned property as well as short sale properties where the sellers may not have the funds to remedy any problems. This is typically why the properties are marketed at such attractive prices. There may be some problems which you might feel comfortable in repairing, others not. You could be potentially taking on a big job, or none at all. This is why a thorough home inspection is vital.
In these types of situations I usually recommend to have at least a home inspection prior to even making an offer so you can make the most informed offer you can. There may be no re-negotiations after an offer is accepted. Yes it will cost you several hundred dollars but can save you thousands if you discover major issues that may not be readily aparent to the untrained eye.
Good luck in your home search, check back and let us know how you make out, just proceed cautiously and seeking the advice of professionals is highly recommended.
Long and Foster Real Estate