Each of these labels could be toggleable.
1. admin rank. It might be useful for new players to identify staff on server who knows things around and could help, however for older one (for example me) these ranks on top of names are totally unnecessary thus I'd like to switch them off (not to mention that often they merge with name and then none of them can be visible clearly)
2. Health bar and name are ON by default / not toggleable.
3. Custom title. On by default. Again this could be totally irrelevant for player to be visible. Why not toggle it off if you don't like them above names. On one hand I thought that players set those custom labels, title themselves, send some message and want other to see it. If there appears a feature to shut them off and ignore, then this feature could lose it's beauty. Perhaps only VIP's could toggle them off (way to attract donation although I'm not sure whether custom labels are so popular that it would be worth donating and switching them off).
4. Godmode title. Is it necessary to be visible all the time. In SEF server we had it like when you shoot a person, text on screen appears notifying that player has godmode on, and that's it.
5. Already described above toggling function necessity.
Once again, problem could be solved by making all those labels switchable off/on (permanently until you decide to change settings).