The J service on AI is rather weak but I think the prices which you can get for it more then make up for it. I will be posting a Trip Report soon from SIN-BOM-SIN on AI J, and there were some interesting incidents which I recall.
The cabin crew came upto me and said the bar service had started, so naturally I thought I'd ask for some cocktails, which was responded with a negative, then I asked for any champagne which was also no, then I finally asked for a mocktail which was also no. I gave up and asked them to make a apple juice/sprite combo for me.
I was also traveling with my parents, and when he asked for a cup of tea, I still don't know how to quite describe it, but it was literally in one of the cups which I would assume I'd expect in a dhaba style restaurant, and sorry I can't describe a dhaba to our non-Indian FTers. There was no cappucino or latte served onboard either.
I think J the service from the crew is brilliant, however the hard product is very weak, but at the end of the day the price I paid for it, it was only a bit more than Y in other airlines, so the other services such as the priority immigration, lounge access and other J benefits really helped, and the recline was also a bit better with slightly larger legspace, and with only 8 seats, the service was on demand which is something which I don't think other J airlines can have, as they reserve that for their FCL