Basically I don't think queensguard can be played anymore without draig bon dhu being used several times + operator and cerys (meaning, all the appropriate silvers and gold) to be proper. Maybe even wild boar of the sea and renew to reuse it; too. By that I mean, that's no longer a good idea to run queensguard when you're not already having all those cards, when you're still early level with a lot of stuff from starter deck. To be playable they will require at the very least 1400 (to 3600 )scraps worth of cards, and that's in order to be playable, not to be competitive. Don't expect to win against nilfgard or any important graveyard hate with them with just that though.
The deck is probably still viable, just not competitive. but the queensguard alone ? Eeeeh I don't know. By round 3 rezing the shieldsmith is worth just as much (9str), and with so many peoples in early level playing frost after frost and SK being the only faction without a bronze unit that clear a row, one body rather than 3 is usually more efficient as well... With multiple draig bon dhu trigger then it can still give decents value. Errr... not as much as the protector for scoia, the reaver hunters for NR, and other big round 3 moves that didn't really got nerfed, but hey.