This game has a lot of aspects to it that just playing it abit won't justify the different types of games it incorporates all in one.
From the combat to the housing and nodes. The types of xp you gain. Contribution to buy nodes and houses. Which spills into the workers that gather and craft. Skill xp and leveling xp. Energy that increases from the knowledge you gain through exploration, crafting and combat. The energy makes it so you can't craft or gather all day it makes you plan what you want todo in a day.
There is just aton todo and all for just 30usd. Pretty hard to compair many mmo's just on the cost alone.