This idea of using +1s as a ranking factor is terribly flawed.
This is similar to saying personalized web results from Google are flawed, because they feed us sites we already looked at in priority.
I would look at +1 as an extension of personalized web search. For sure the number of +1s *could* be used to influence organic search results, but that would be very easily gamed, so in my mind this is not the ultimate objective. Also we must remember that +1 is google's answer to Facebook, not it's answer to getting more relevant search results. I think that in it's fullest possible implementation, +1 search can have it's own category (i.e. it's own google search results tab), so you can only see that if that's what you choose to do.
If you've used Facebook search you will see how powerful this can be, finding stuff you already know about because a friend mentioned it, but can't remember enough details on to find it again. This happens to most people on a regular basis.
I would have to belabor the point that if you aren't a facebook user, this probably makes little sense.