Magic missile can become a lot more potent than that (on average):

1. Make a Scribes wizard
2. Take the Elemental Adept feat and pick something that very few creatures are immune to, e.g. thunder.
3. Change the MM's damage to thunder.

Now you can pew-pew to your heart's content with each pew doing a guaranteed 3 damage instead of 2, and puming the average damage of the pews from 3.5 to 3.75. Not a huge jump, but if you upcast it to level 5 with 7 pews, that's 26.25 on average instead of 24.5 with a minimum of 21 instead of 14.