im still playing it.
I have about 3 days total play time and pretty much have all accomplishments, achievements, and missions in the game completed. this is for sure, a light mmo.
but they add new worlds to play at pretty frequently now.
and the lot building with just the lego building itself is pretty involved. they got events similar to blockland as well (although done very differently)
there are a lot of rare items to collect to.
i run a shop from my home lot. where i sell rare drops from my dragon killing. and sell models of cars and animals i created.
there isn't grinding though. the game has no exp or levels. the only 2 character stats, are given by equipped items. and no items have requirements other then being able to afford or find them.