At best, it is visual pollution, and at worst employs subtle forms of mind control to encourage people to do what the advertiser wants. No thank you!
However, it is useful: it helps disemenate information. Didn't know about the all new BMW i3 electric car? Thanks to some ad, now you do. Most of the time you don't care, but when you do care, it can be useful.
The Internet is much better at dissemanting relevant information than advertising, however. Why should I watch an ad for a movie if rottentomatoes.com has all the info I need? Why look at car ads when websites will happily tell me the pros and cons of various cars? My hope is that eventually the best products and services for me will be peer identified an given to me when I need them. Ads will no longer be necessary. The peer review process must be paid for somehow; manufacturers may end up footing the bill, or perhaps ads from unpopular products will; either way I cannot wait for this garbage/propaganda called advertising to vanish from the earth.