Re: Aren't Wordpress Plugin great!
One problem with WordPress is that it's all too easy to give the "wrong" people the Administrator role, which really should be only reserved for whoever setup and keeps the actual WordPress installation running. The lack of a role inbetween "Administrator" and "Editor" (i.e. one that can't change plugins/themes/core WP, but can do everything else an Administrator can do) doesn't help either.
It's not uncommon to see a WordPress site with a dozen or more users, all of which have the Administrator role - madness!