I used to work with loops all the way. Once I got to grips of battery and reason rewired ive manged to come away from all that and make the track in SX from scratch. Sometimes they help fill your mix out somewhat but I personally wouldnt bother getting into it too much. Esp if your running a soundcard with a few outs and an external mixer. Its also worth ripping sounds from other genre's and manipulating them. I wouldnt sample peoples grooves tho. Its much more fun and flexible writing them in using midi