The Sigma 70-300mm has an average review score of 70%

Score (%):
Sigma 70-300mm f/4-5.6 APO DG
Coming from Sigma's DG range, this 70-300mm optic is suitable for film and digital sensors up to 35mm in size...
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84

Sigma 70-300mm f/4-5.6 DG Macro APO (Tested)
Multiple user reviews on slrgear.com
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73

Sigma 70-300mm f4-5.6 DG OS
This 70-300mm is one of Sigma’s DG lenses, which means it’s been optimised for digital SLRs with smaller sensors but can also be used on 35mm film cameras and full-frame digital SLRs. It offers a good telephoto range even on a full-frame camera, but on an APS-C digital SLR it equates to approximately 110-470mm. And at that kind of magnification, you’re going to be glad of Sigma’s Optical Stabiliser (OS) technology. Like other lens-based systems, it moves an interna...
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80

Sigma AF 70-300mm f/4-5.6 APO DG macro - Review / Test Report
The full in-depth review from photozone.de
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43