It was probably not their fault that it started before 10:00! For goodness sake, Merlin might not be the best company in the world for customer satisfaction, but can they help it if the system went live too early? Had it started on time, people STILL would be claiming that it was unfair, that they did not last long enough. I'm not the biggest Merlin fan ever, but people honestly want to bash them whenever possible.
Go and buy your 12p tickets that will inevitably arrive on eBay in the upcoming days.