I have found the food and quantities to be consistently satisfying. The chef routines are always the same, but you can deal with it if you keep your visit to once or twice per year. I do enjoy going with others who've never seen this style of dining, as it's fun to watch their expressions as they take in the experience.
A few minor beefs I have in relation to going with a larger group on a weekend are that you feel more limited with time (they don't mess around with maintaining customer turnover) and you can't visit very well because it tends to be loud. I'm also not a fan of their reservation system and do consider this outing to be slightly pricey. I have also noted that you freeze your butt off in the ladies restroom in the winter months.
I do end up at JV an average of once per year, so clearly it continues to be worth the trip.