Genre boundaries can be somewhat amorophous (rather like the definition of "literature" ), but cyberpunk like any genre has certain characteristics we can look for, and most are present in Bladerunner. Do Androids Dream of Electric Sheep? could obviously be counted as cyberpunk writing, except that it predates what's generally considered to be the birth of the genre. It and Dicks decade later story A Scanner Darkly might be said to have spawned cyberpunk in much the way that cyberpunk spawned steampunk. Beyond what I said above I'm not sure I (or anyone) can tell you what cyberpunk is; at the risk of invoking Morpheus again my suggestion is to RAFO; the Sprawl Trilogy can be done in a day or two if you've got some free time over Easter.