I think it is week. I don't mean to piss you guys off because you like it, but it just seems childish to me. Also, I don't think they should have a giant counter on the site that in the end may just point out how badly they failed. I could be wrong, and if I am, on St. Patricks Day my name will go from McGaughey to McMudd.
I can see where you are coming from, however, I don't think childish is the correct word for it. Does that fact that they are utilizing interactive communication, and letting the user build the content of the message make it childish? I'd like to hear you expand on what exactly is making the campaign childish. The only aspect where I could see there being a misconception of it being childish would be the "convince a skeptic" section. I see that as being more humorous than immature.
The success of the petition signature shouldn't directly reflect the success of the campaign. With a static media, you wouldn't even have the option of measuring results with user initiated feedback. I'm sure they will study the success with measurements such as unique visitors to the site, the amount of time spent navigating, and the impact it had on social networks.
With that said, and agreeing with Dena, this campaign hits home on all levels with its target. A premium beer brand like guinness already commands much pride and loyalty within their customer base. The campaign stays true to the brand's Irish roots. More importantly, it gives the customer a sense of participation in the message, which is more engaging and powerful than a static, conventional media spot.
Ultimatley, the end user finds a purpose in the message. Is the audience taking it too serious, probably not! We just dont want collect coupons and turn them in for plastic key chains anymore. The experience is cultured and is influenced with great design.
Neat, very simple and effective. Good use of interaction with the consumer - makes you want to visit the site to find out what exactly they are getting at. Regardless of your reaction (E.g. "This is stupid") you have a fair chance of at least bringing it up in conversation.
When Allstate (I think?) began the "Now What?" ad's, I remember looking up the website. For some reason it hadn't even occured to me what to expect - whatever my subconscious wanted, I was disappointed to find it was advertising for insurance. The upshot was regardless of whether or not I liked it, I did mention it to my friends in casual conversation, and we all discussed how annoyed we were with what we got, despite not even knowing what to expect. It generates word of mouth.
I thought it was week when it was posted, and said time would tell. I think time has shown it to be a less then good attempt. I guess that I don't have to change my name to McMudd.