It seems to me that, while it's situational, witchbolt could work if someone else in the group can grapple, hold, or otherwise immobilize an opponent.
Sure, it's not an amazing option, but if you have any desire to conserve spell slots, you'll be making a decent contribution with a single slot.
Also, if you can corner an opponent (like blocking the single exit to the room) you can easily deal automatic damage averaging 6.5 until your concentration ends. Witch Bolt is a kind of spell you want to cast on opponents that have very few mobility chances. At worst case, you force your opponent to a disengage. When you are fighting a big bad guy, that disengage would mean a lot.