Long kit lenses?

I am considering looking for a second hand (cheap) Canon long end kit lens (IS) for my old 350D (and the upgrade to something newer I am rolling towards) and was wondering if anyone would advise against it?
Do they have any really nasty unresolvable image quality drawbacks?

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It is the mark of an educated mind to be able to entertain an idea without necessarily accepting it. -Aristotle

...oh, and I see by the lack of responses that I am right yet again.