1) The CR 1 Brown Bear (moon druid wildshape from level 1-5) has 34 HP, not 54. The Dire Wolf (Also CR 1) Has 37 HP, and the CR 1 Giant Hyena has 45 HP.
Yes, in the early levels, moon druid wildshape easily outclasses others.. but this drops off very quickly. They are stuck with the same forms...