I would give this 5 stars but the thing about connecting with wordpress.com is not cool. So, 4 stars.
As, the features like sharing do not require to be connected with wordpress.com. It would be great if this was independent without having to create a wordpress.com account just to use few features.
But overall does a great job for handling many functionality under one roof.
Perhaps in the future update, no wordpress.com connection required (being hopeful).....