Does Command's effectiveness scale up as you level up and face greater challenges, or is it mostly only useful at the lower levels?
If its usefulness doesn't scale with you, does being able to cast it Quickened (as a Sorcerer) extend the range of levels at which it remains useful (by trading a Bonus Action for your enemy's Action and Movement)? This could be used to either grant Advantage on melee attacks ("Grovel"), or provoke opportunity attacks ("Flee"). In the latter case, you would be dealing damage with your Action and Reaction, and your enemy would essentially be foregoing its turn.
Further, with the Drop command, you could deprive an enemy of its weapons/implement/shield (i.e., Disintegrating/Burning it or grabbing it from the ground and moving/throwing them away).