Ensnaring Strike or Entangle that can't be broken unless you kill the Ranger or make the save/check is nasty if you can force disadvantage.
Any large or smaller would be screwed.
Yeah. Restrained is hardly OP at level 13, especially when they need to fail the save to even be restrained to start with.
Consider Wizards are getting Hold Monster and a no-concentration Forcecage at this point.
Moreover what is the excuse on the 17th level ability?