I did, many years ago (awful) and most recently, last year SVO-WAW.
Last trip - short and uneventful, service better than LOT but not near Swissair. Food was decent, but that's true of most European airlines.
They are an up-and-coming airline, using mostly Western-made aircraft (we flew on B-767). I have no idea of their safety record, on-time performance, customer service, etc. My guess - they are average, at best. But having KAL and CSA in the alliance already, Aeroflot is not much of a step down...
[This message has been edited by MileJunkie (edited 10-26-2000).]