It probably depends on what features are important to you. Some versions had bad ghosting in the web browser, some in the PDF viewer, currently (3.16.0) in the dictionary popup. I hardly ever use the browser or dictionary, and never read PDFs, so none of those worryied me.
I like the current 3.15.0 - 3.16.0 versions best because despite some very bad ghosting in the menus they refresh after closing the reading footer menu, so I can trigger a refresh anytime while reading by double-tapping the centre of the screen. You have to go quite a long way back to find a version that still had that feature.
I don't know of any patches that affect ghosting, but most of the menu ghosting in version 3.15.0 can be fixed by adding the line LeanAndMean=false to the [FeatureSettings] section of the device's config file. That option doesn't work in 3.16.0. (But I stay with 3.16.0 because the improved kepub hyphenation makes up for it.)
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