We were there in Oct, so lower crowds and temps. I do not think I would go in the heat of the summer since it is outdoors and it gets a little hot under the pavillion because of the lights and people.
My son was 4 the last time we went, and he really had fun dancing along side the characters. It kind of reminded me of the dance parties at the ticketed events at MK (like
MNSSHP). The characters come out and are immediately surrounded by kids, which is fine, but then the kids are surrounded by adults trying to make sure THEIR kid is closest to Mickey, etc. It was a little annoying - but you know what - people are equally as rude on Main Street 10 minutes before Spectro starts, so it really didn't spoil anything for us. The shows in between the dancing were fun too - a roping cowboy and some line dancing - not something we see here in NY very often.
I watched some clips on You Tube and read about it before we went, so I knew what to expect, character and food wise. I think a lot of people that didn't like it it probably didn't know what to expect, or were unrealistic about what "dancing with the characters" really means. If it says "BBQ" then no one should be surprised that the menu is BBQ chicken, BBQ ribs and hot dogs. If it is an event with characters, no one should be surprised that there will be lots of kids there, all wanting attention from Mickey and the gang.
The food is fine...well, the burgers are gross, but the rest of the food is fine. It's picnic food served to the masses - not a gourmet meal. The unlimited wine and Mickey ice cream bars were a highlight for me - and surprisingly they do go really well together.
I'm a firm believer in trying (almost) everything once to form my own opinion. If you're going during the steamy summer months, I'd do HDDR for the a/c alone. But during another time of year, the BBQ is lots of fun, especially for the kids.