The trouble is, the definition of World Class comes down to opinion. All these polls do give a vague definition but they're very much driven by the huge theme park communities who go on theme park trips around the world. TPR for example, when they come to England, Nemesis ranks higher in most of the polls than when they visit other countries.In my eyes, Oblivion is World Class, for example, and I'm sure in a lot of people's eyes, Air is too. Nemesis is still my favourite coaster of all time... sadly I don't think the UK will see that amount of planning and for a project on that scale again. The problem is with entertainment, sometimes it can be hit and miss because audiences can be so unpredictable. Once in a while though, all the stars will align and you find yourself with an absolute cracker of an attraction. Manta at Sea World comes to mind. It was often overlooked in favour of Rip Ride Rockit during its construction, but then when Manta opened, ahead of schedule and to rave reviews (it really is one of the best coasters in Orlando) it put Rip Ride Rockit to shame.... which is still, to an extent, suffering from problems.