They make great buying opportunities if you can finance one. You can make invest in making a title change, then you're good to go with refinance or sale in order to realise a gain.
Debbie Williams wrote an article in YIP mag a while ago on that strategy. Can't remember which issue, sorry.
It's one of those "R" things they often talk about as a way of making quick and easy money on a property deal eg.
Re-zone
ReTitle
Renovate
Rcan't remember the other ...