has nothing little to do with the lens, I just shot it with a really shallow depth of field. The undulations are the actual curvature of the toy, the angle I shot it just accentuates it. Here's some shots so you can see it's transformed properly with a greater depth of field. And remember, the nose cone is rubber, it just doesn't want to line up straight. *shrug*
This group of shots were taken with the Nikkor 12-24mm f 4 EG DX wide angle lens, pretty widely regarded as one of the best wide angle lenses available for crop frame cameras. There's distortion at the edges so I tried to keep Jetfire in the middle of the frame