I've offered over list on a couple of Freddie Mac homes and didn't get them.
There is NO rule, what matters to the REO manager is a combo of factors such as time on the market, how depreciated the asset is already, the holding costs and overall activity level, how quickly the buyer can close and how "clean" the offer may be (such as how many contingencies, and how likely they feel the party is to close vs. tying up the property). Owner vs. investor is also a factor. Other offers vs no other offers, etc. How solid the deal looks is a factor.
Look at it based on list vs competition and recent sales. The list may be higher or right where it should be. Even below market. The degree one expects adjustment depends on where it sits in THAT spectrum.