Worst ever model for me was The Thunder Tiger Challenger. It was a 1/8th Scale off road, futuristic metal caged buggy. You might find one in a back of a shed somewhere now, I doubt there are any running as it was over thirty years ago. The front wheels just kept bouncing as there was too much rear weight. 21 size engine. But at the time it was better than the Mardave Marauder, and some of you would know how bad they were.
Oh' and we didn't have the Internet then to talk about it or research it.