I noticed some issues with the SEO of some of my sites and in digging into the source, it looks like metatag is the culprit. By default, the global settings provide [node:title] or [current-page:title] or whatever which seems to completely skew all prior SEO that has been done to a site. From what I can tell, Google has started taking more precedence with the og:title property vs the html title and if someone doesn't know any better when installing or upgrading metatag, it can completely hose the site SEO... I use the page title module and while I know there are still issues to be hashed out between metatag and page title, I found it rather odd that metatag would assume and impose certain SEO defaults on a site, instead of letting the maintainer define those values (I guess it's six one way, half a dozen the other... some people want the defaults, others don't.) Unfortunately, since SEO takes time to propagate, it isn't something that is quickly noticed.
The fix I found, was to delete the tokens for "title" (since I use page title) and "og:title" (since page title doesn't work right) and just let the SEO chips fall where they may with the html title tag. I don't foresee Google requiring the open graph standard on sites anytime soon and until things are more stable with metatag, I feel it is safe to use the standard that has been used over the last 10 years.
I guess my request is to have the title tokens removed from the global settings, instead of "assumed" by default. If I remember right, I think the global front page token default is set to [site:name]... talk about a complete homepage SEO killer except for people searching for the name of your site or business...
Am I completely off in my thinking or is this something that needs a bit of attention?