To each his own I guess. Each type of smoker seems to have their own characteristics and each gives a slightly different end product.
In a year now with our 009 we have probably done close to 50 pork butts , beef shoulders etc. Just about everything we have done has come out excellent. The burning grease taste (or aroma) has a lot to do with it. I guess what I'm saying is that this is just the nature of the beast, much the same as the flavor imparted from juices dripping on hot coals or charcoal grill give a different flavor.
One thing to keep in mind though is that the flavor will change the more broken in your unit becomes.