I find I don't like reading long case studies, nor do I like reading case studies which are just screenshots and no description. I've targeted 2 short paragraphs for mine: one to describe the brief, one to describe what was done.
The common layout is: one main device view (no set format, different for each project) for the hero image, headline written over a background in the project's key colour, previously mentioned paragraphs, and then some more screenshots to follow. Some of the other case studies have many more screenshots that this one.
The site uses Scott Jehl's picturefill for the images which works pretty well.
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