The UI might not have major aesthetic problems but they could probably be more consistent between services.
I think you might have hit the main issue on the head though, unless you use a service regularly it's difficult to do much without the hefty manuals and while the services may be complex they could make the common or "beginner" paths more obvious.
Having sane defaults where possible and splitting basic and advanced settings could make it more accessible while allowing users to get familiar with the tools. Ideally a good UX should cater to a variety of proficienies and help users learn.
I think you might have hit the main issue on the head though, unless you use a service regularly it's difficult to do much without the hefty manuals and while the services may be complex they could make the common or "beginner" paths more obvious.
Having sane defaults where possible and splitting basic and advanced settings could make it more accessible while allowing users to get familiar with the tools. Ideally a good UX should cater to a variety of proficienies and help users learn.