My DW and I ate at H&V in March 05 as part of a Fantasmic dinner package:
The variety was pretty nice with a good salad bar area, a few different meats and vegetables, a kids area with typical Disney kids food (pizza, burgers, man & cheese) and a nice selection at the dessert bar. The décor is 1950s era diner style. Our server was attentive. All around a nice meal, nothing too fancy (it is a buffet, after all) but nothing spectacular. The food was good, certainly, but I wouldnt say it is the greatest place in any of the parks. Should be no trouble finding something for everyone in the party to enjoy and eat their fill. We would go back on our next trip with no hesitation, though we might try other places just for the experience (this was my first visit to MGM, so Ive not eaten in any of the other TS locations in that park
)