Page Rank is really not something you should be looking at as far as how to rank your sites. That alone any way. It's a metric that is dieing out and not going to be used in the future. The Page Rank formula is not even owned by G and I doubt they will renew the patent to use it. I've got a PR 6 domain and you would think based on high Page Rank it would rank all over, well it does not. There are so many other factors that are being considered in ranking high. G is making it tougher to manipulate search results. Things that should be considered are foremost, social signals. Those are right now and I believe for a extended period of time in the future, going to be huge factors in ranking. Then bounce rate and how users interact with your site. It's all going to be tracked. If your not socially popular and there is no 'buzz' about your site/page then it's going to be hard to get decent rankings.