The Sigma 18-50mm has an average review score of 71.7%

Score (%):
Sigma 18-50mm f/2.8 EX DC Macro
If you're looking for something a little more than just a standard zoom, Sigma offers a few lenses with macro capabilities built in...
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88

Sigma 18-50mm f/2.8 EX DC Macro
Multiple user reviews on slrgear.com
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84

Sigma AF 18-50mm f/2.8 EX DC Aspherical IF - Review / Test Report
The full in-depth review from photozone.de
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43