My niece next to me felt similarly ripped off when her 'Lickety Split Banana Split' arrived with a five-centimetre sliver of banana sitting under two scoops of ice cream. I'm not against feeding children small desserts, but I feel that to do so after giving them exciting names is a little cruel, although to be fair perhaps the 'lickety split' part of the name was a warning about how swiftly the small serve could be consumed.
On the plus side, the stressed-out waiters were very polite (apart from reminding us that we had been told there would be a wait) and did give us a 20% discount (after offering free desserts – we felt that life was simply too short).
The final verdict: Watermark, get your act together. A restaurant charging your prices and demanding bookings has absolutely no excuse delivering such shoddy service.