Your analysis is correct but one sided
#Your analysis is correct but one sided
YouYou have accurately pointed out many of the advantages of the Moon Druid. It is true that it is one of, if not the strongest subclass in the game. But you have failed to account for some of the drawbacks that limit their output.
Experience
##Experience
II am currently playing a Drow Druid. In my party (level 6) we have a Champion Fighter, Rogue Scout, War Cleric, Evocation Wizard. I have been tracking the kills and damage output in combat since the start of our campaign. Early on, I was slightly in front as Wild Shape gives a huge bump at 2nd level. As the campaign continued however the Rogue quickly overtook me as she increased her damage output with additional sneak attack dice. After gaining Extra Attack at 5th level the fighter has also surpassed me in damage output. At 6th level and gaining a magic weapon the fighter in by far our highest damage dealer.
Level 6
##Level 6
ThisThis opens up new Wild Shape forms for the Moon Druid for the first time. CR2 forms are a big step up from CR1 and will address the reduced power at level 5. The best damage combat form at this level is the Giant Elk. 4d8+4 damage against prone targets is nothing to be sneezed at. There are other great options such as Giant Constrictor Snake but they all suffer the same low AC.
Are they OP?
##Are they OP?
TheThe Druid is likely the most versatile class in the game. They can be a competent healer, decent melee character or a pure damage spell caster. However they can't do it all at once and will never be quite as strong as a character that focuses on one area.