We all loved it and I'm definitely over 16 (unfortunately). My one real gripe about Disney Quest is the food (not the cheesecake area which is good but the pizza, chips etc area). They seem quite unable to cope with anyone wanting food - and the queues just build up, everyone gets angry and it is very unpleasant.
I've also noticed that many of the CMs at DQ are nastier than in the parks. I wonder if this is because it appeals to teenagers and they think they can get away with it here. Never seen so many rude CMs in one place before.
The place itself though is really cool. We've spent several days there and really enjoyed it. We all like amusement arcades anyway but this is something special. The 'Pirates' and 'Aladdin' rides are particularly good.