On my last project, I use All in One SEO Pack (AOSP) plugin (it is no longer maintained) to ease my client on changing their meta tag instead of editing the template directly. I ever used this plugin before but never take a look deeply in meta tag generated.
When I realize that my client’s website are not indexed by Google for almost two weeks, I started to find what caused the problem, because the web stat said that Google robots visited the web. In the end I realize that the problem is caused by the default page for my web hosting. I look at the HTML code and notice that sometime AOSP create meta tag description without any value in it. :O
Even if it created a description, it was not reflecting the content because it only took for some words from the first paragraph. Therefore I am planning to do a hard coded meta tag in the template tag, while looking for another alternative for SEO plugin for WordPress.
If you folks want to share your experience using any kind of SEO plugin, please share it with us here.