If you see the rest of the site, you will see threads of people complaining about every single update since iOS 1.0 (yes, including battery drain issues).
If you were to listen to those people, you will never upgrade. iOS 5.1 was in beta for like 3 months and with every beta release it was always reported that it did not have many changes, so if you were expecting some big new features with the final version, well then you got your hopes up for nothing.
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I took this screen grab and the last link is my favorite because somehow that person had battery drain issues just 2 days after the official launch of the iPhone in 2007.