Some like Seth Godin readily acknowledge that marketers are liars. I agree with him and extend the proposition to all business people, myself included of course, especially if one considers that it is a lie to omit something. On the other hand, I think everything is a matter of what objective one is pursuing.
The "whole truth and nothing but the truth" is not an objective per se in business and I am not sure it is in courts of law either or at least not in all cases. Not even sure it is a good idea in other areas of human life. Else, the fine arts of cinema, science fiction or even painting would not be possible. From partial and questionable definitions of what sex actually is, whether oral or otherwise, given by a President I liked much more than the current, to the "somewhat" biased presentations of marketers or the preposterous communication of political campaigns, spin is something I witnessed many times. It's just part of human life; you see I don't particularly believe the "perfect green apple syndrome" is a particularly functional way of doing things... Imprefection is fine, although I don't particularly enjoy perfect imperfection! Today, I came across a great summary of all the lies, mostly driven by the best of intentions (as ever), that engineers (particularly the software kind) feed us on the market side of the business... Go read it, it is awesome and incredibly true (unless of course it is YAML = yet-another-marketer's-lie).