We moved away from this system when I decided to expand the staff group away from Me + Hello World.
As of our current system, the regular player promotion chain looks like this:
Registered -> Member -> Senior Member -> Veteran
The admin chain looks like this:
Member (required) -> Server Administrator -> Head Administrator -> Staff
The idea is that Staff is now the old Global Rank + old Staff combined.
As such they do all the server, forum moderating that is required.
With time Head Admins may join the staff team depending on various factors.
As for having forum abilities, warnings will always be staff only, as will forum bans.
Staff will also always finalise member reports as we do checks for various things before promoting people.
These new ranks don't really add much in my opinion and I have always modified the ranks myself to a system I like.
There will be a survey coming out at some point about Invex which will include a question about ranks where you can share some thoughts.
My only issue right now is perhaps the upper ranks (Senior Member/Veteran) and (Head Admin/Staff) are too hard to get but at the same time that is kind of the point.