I liked cloud of daggers. Moving it is good, because it's absolutely possible to basically burn it and not have it be that useful past a turn or two, but just taking away positions for enemies to be has value.
Maybe not compared to something higher level like Hunger of Hadar I used a lot with my warlock later game, which covers more ground and affects movement as well, but making it harder for a caster/archer to sit behind a doorway and harass you is useful the way I played.
Fun for team kills where your barbarian throws an enemy bodily into the cloud. Bonus points if the enemy just ran out of it earlier that round. Or, void bulb - I always go out of my way to pick those up.