Dinner in 2008.... it was OK.... not really nice.... nothing special... a very low quality buffet... Went for the character lunch in 2009, only went back for the characters. Still very low quality food... This was like an all you can eat chain buffet but much more limited selection, very limited. The characters? You can see Little Einstein characters in the park. We didn't have a miserable lunch... we ate, interacted with the characters, DS liked the music, service was good. It's just the food was so boring and there are characters everywhere in Hollywood studios.
Honestly, there are better places to spend your money. We thought some of the food at SciFi was not great... but we enjoyed the movies and the car tables and the burgers, fries, and onion rings were pretty good! Mama Melrose was good but nothing exciting. We are looking forward to 50s Prime Time - this seems to be the place to go....
I wouldn't do breakfast at H&V either because, I think it's very important to do as much as you can in the morning at Hollywood Studios before the crowds roll in.