Probably the mediocre-est lens that Canon has on the market right now is the EF 75-300 f/4-5.6. It's bundled as a kit lens with lower end cameras. It was first released some time ago, though.I don't think Canon have released a truly BAD lens regardless of target market for a long time. Their cheapest EF lens, the 50mm f/1.8 STM is a superb optical performer for example.
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