Commercial birds can taste good, try varying diets and encourage them to range, I have conducted numerous trials with commercial birds trying to introduce flavour and texture, tried everything from feeding birds milk to Lucerne , feed has an enormous part to play in creating flavour introducing different forage such as chicory on the range also is very beneficial, the most important thing with any diet is to create finish ie a nice covering of fat all chefs will tell you that fat is flavour and without doubt is the most important thing to achieve wether the bird is a traditional or a commercial , I always relate back to my late father one of his favourite sayings "takes the same amount of time to feed a good un as bad un" true to this day its always disappointing when you put a lot of effort into feeding a bird and end up with a bag of bones, a commercial will rarely disappoint in the growth stakes but can be a let down on taste but with a bit of imagination and thought with feeding can stand up to its traditional counterpart,