Sword of Spirit
Legend
The few magic weapons and armor without pluses that are already in the DMG tell us that the game designers think you can play without pluses just fine.
As for myself? I'm fine with pluses, but a flametongue with +0 is still more interesting than a +2 sword. I don't think many players will complain about replacing pluses with something else unless they are the type of player that is really into the numbers. (Or, they might have a thematically appropriate concept of a sword that actually just is more accurate and damaging--it's simply "enhanced".)
As for myself? I'm fine with pluses, but a flametongue with +0 is still more interesting than a +2 sword. I don't think many players will complain about replacing pluses with something else unless they are the type of player that is really into the numbers. (Or, they might have a thematically appropriate concept of a sword that actually just is more accurate and damaging--it's simply "enhanced".)