Cheap and cheerful- the best WORST lenses

A member recently asked which would be a nice sharp zoom lens to buy, and suggested the 18-105. This member was soon inundated with recommendations for lenses costing upwards of £1000....

I think it would be interesting, and useful, to know which are the best 'worst' lenses. Which are the Davids in the land of the Goliaths?

I think these should be lenses that would set you back

May I start the ball rolling with the 18-70mm 3.5-4.5 AFS DX, which I picked up second hand for £130. I have been more than pleased with the results from this lens.