It appears that people who search the Internet think more positively about pay-per-click (PPC) ads, compared with SEO. The Web site whatdoestheinternetthink.net can tell you how people view a particular topic simply by tying in and searching on a term or keyword.
Searchcowboys.com provides a variety of examples. The difference between negative and positive was very small with the term Google--1.2% more positive than negative. Bing got a few more negative votes than positive. The site provides sentiment across Google, Yahoo, Bing and Twitter.