Zbugz kind of beat me to it, but I'll chime in anyway.
BTRBBQ is a different beast than HoopDeDoo Revue. That venue is theater with dinner. BTRBBQ is an all-you-care-to-eat BBQ that happens to have limited live entertainment.
The real reason to go is the food, which we find to be delicious--especially the cornbread and the slaw, which are SO GOOD. We enjoy the ribs, and sausage (available at dinner only), and the veggie skewers are also good. The roasted chicken is also good, but we prefer the other meats. It's not the best BBQ ever, but it's better than many BBQ places I've been to outside of a theme park, and I would actually pay to eat there outside of Disneyland.
The entertainment is pleasant. It's a guy with a guitar who sings mostly folk songs, and Miss Chris, who sings with a pianist. My daughter loves going up on stage with Miss Chris, but honestly, if you aren't close to the stage (or don't pay much attention), it's background music that adds to the ambiance of the venue.
As for not including alcohol and dessert, you're not going to get alcohol in Disneyland proper unless you're at Club 33, and even if you ordered a dessert (and you should, because they're delicious), it's still one-half the price of HoopDeeDoo.
We find BTRBBQ to be one of the better values in terms of food quality and quantity for the table service restaurants in the park, and we also like the atmosphere very much. It's an relaxing break from the hustle and bustle, and a good meal that everyone in our family enjoys.
If you don't like the menu and don't think you'll get your money's worth, then by all means, choose another restaurant for your trip where your family would be happier. I just don't think it's fair to compare it to a WDW venue that really is very different (not to mention much more expensive) and express disappointment that you won't get the same experience. It's like many things at DLR--similar in some ways to WDW, but its own unique experience.