My experience has been the norm every time I have visited Knotts. Mr Potatohead is viewable from the walkway moreso than the queue and the queue is beside it/behind it except the entry point. Buzz you walk past and see a little bit of his show. I wouldn't point to Buzz as a particularly strong attraction either.
And so far Iron Reef has been compared to Ninjago (Legoland), Battle for Metropolis (Six Flags), Ghost Blasters (Castle Park), and Kingdom of the Dinosaurs (Knotts Berry Farm.) Somebody enjoy cherry picking data over there? Look, if you like Iron Reef, that's fine, but don't get upset when others point out how the ride doesn't measure up to Knott's quality nor is it an enjoyable experience for them. Seeing as I'm always rushed through this supposed "preshow," I'm thinking the ride isn't all that popular.