'lack of smoke flavor' , could potentially result on any pellet grill, depending on what your expectations for smoke level are.
What I don't get is too dry. Only dry ribs I ever had on any pellet grill, were ones that just didn't have much fat content. I've made ribs on a variety of pellet grills, and I can't say that any one of them was any less juicy than the others were, hard to imagine anyway that the pellet grill itself could be to blame for such a issue.