The flight is okay; what bothers me more is that it can be attacked (in 5e a spiritual weapon is invulnerable) plus enemies get attacks of opportunity against it. This greatly reduces its usefulness when it only gets one attack anyway (so can miss entirely), as it will rarely survive long in a fight. While the fact it can be attacked means you can occasionally use it as a distraction, as an actual weapon it's a lot less good than it should be.
