Put the address into Zillow.com and see if it has gone down 25k since that appraisal. Many properties have.
And look at Zillow's comparables, and comparable recent sales.
People have to live somewhere so rentals will always have some value. It seems to me if the rent will carry the payment plus repairs, plus some spendable income for you, then it won't hurt you to buy and then wait several years (and it probably will be) before you sell it for more.
You might want to start your own thread for this subject.