Actually if you think about it logically then there is more chance of a Midi drum track having feeling than an audio drum track, this is because a real drummer never plays exactly the same twice, (Slight variation on where the stick hits the head for example) and using Drum samples you can have multiple hit samples that vary in real time rather than being locked to the Midi drum track, (This is the reason all the Drum VST are so realistic sounding) a drum audio loop on the other hand will play exactly the same time after time with no variation, and thus after a time it sounds unnatural. (If you have plenty of storage then you can have multiple loops that play randomly like drum samples which solves the problem, but currently there is no hardware arranger that has the capacity to achieve this without glitches)

Bill