Certainly regulating temps in the smoker and the meat itself greatly impacts the outcome and perception of it tasting "good."
I wonder if your success, or lack there of, is a matter of taste? Many love the taste of smoke, some do not. There is a restaurant near me that gets rave reviews. They have a huge smoker outside where they smoke EVERYTHING, including sides. For me it all tastes like licking a fire poker and I can't tell any difference in taste from their chicken to their beef to their green beans.
At risk of being banished from the Traeger community, I will tell you I do not like much smoky flavor, and neither does my wife. For this reason I never had any interest in a smoker until we had a brisket made by a friend. It was the best meat I've ever had in my life. I was instantly sold. I'm about a year in and we have really had some great food. We have intentionally used pellet mixes that are mild and avoided swings in temperature that might produce more smoke with the meat. As far as meat, we've enjoyed large briskets, pork butts, and ribs. They are fantastic. We have done potroast, beer can chicken, and spotchuck chicken a few times each and it was ok. Truth be told I'd rather have had the chicken on the grill and the roast in a slow cooker. As far as steak, I'm sure I'll try it eventually, but to date I just haven't been able to bring myself to put one on my smoker. I love a grilled steak and I don't want a smoky steak. My only thought for you is maybe try a more traditional meat cook such as ribs and see if the family enjoys it.