The users have to click a button to close the notification banner. Some users are more concern about their privacy and may delete frequently their cookies. As they will need to accept cookies every time they revisit a website after clearing their browser cookies. This law more than inform or protect will annoy the most concern users. This can dissuade those who want to protect their privacy and don't like being targeted by advertisement.
And this group makes fun about the cookie law:
"We've taken all our cookies solutions off all our websites. The evil cookies are back, and the pointless slidey warning messages are no more." –nocookielaw
Curiously, websites using third party social media cookies (the major threat to online privacy) are exempt from showing the notification message. I'm talking about the Facebook and Twitter likes and follow scripts that are everywhere, please stop using it in your website. Why are you using it in your website? if your customer is already in your site, you are just sending your visitor somewhere else, where your customer will be easily distracted and making it more difficult to return to your site.
