I can’t get NTP Client to work at all on my RB4011 with 7.1beta6. I set it to Enabled, added addresses in the Servers section, yet it refuses to update. The same addresses worked on a different device with v6, so this is likely a bug with v7
Without seeing your config hard to say.
What mean “borked” on the title?
Translate says is “Bored” on Hungarian…
NTP Client is bored?
I found that the NTP client can only be configured properly from the CLI. Certain things like using DNS names for NTP server addresses do not work in the GUI. Configure it through the CLI instead and see if there is still a problem.
These are the settings I use (a verbose export):
/system ntp client
set enabled=yes mode=unicast servers=pool.ntp.org
/system ntp client servers
add address=pool.ntp.org auth-key=none disabled=no iburst=yes max-poll=10 min-poll=6
"Borked" is a funny/slang take on "broken" 
Ah, ok…