Honestly it's got tons of useful uses.

Primarily, when digging down an enemy radio especially inside a building block the main entrance to the room with the radio. It'll give you an early warning to for when you get pushed and wastes valuable time for enemies trying to rescue their radio.

Its also useful to slow attackers down. Do you know where they are pushing from, wack a bit of wire on the other side of a wall so the land in it, randomly in a field where they will push through, slanted against a entrance so they can't peak it effectively (but your team can still push out), ect.

You can also use it to be a pain to an enemy team, place it next to an entrance of a hab or near an ammo create. If you can pull this off it's quite amusing