Uninstalling the Communities plugin

Hello to everyone, (My first post)

I have installed the communities plugin on a (localhost)site and now I am uninstalling it.
My question is should I delete the database tables created by the plugin?
Does it make any difference?
Do the answers to these questions apply to none, some, most or all plugins that create DB tables?

Also I think that the communities plugin is a good idea, but that the wiki editor/feature would be better if the editor was the same (or similar) as the main WP editor used in post and page creation. As it is now I don't think the average client/user would consider using it... Are there plans to further develop it?