this game has alot of history and i do not know which reviews you read. and i do not know what games you like, what you have played before in the past and your gaming tolerance. so all i can say is below.

it originally was mostly single player.

there is 2/3 different 'story-lines' to follow. but they are not actual quests to complete. and you have to read alot to appreciate the stories. if you don't like reading, or putting stories together (like a jig-saw puzzle), then essentially there is no quest and you will eventually find it boring.

there is better handholding (compared to the past patches) in terms of understanding the game and crafting mechanics. but otherwise treat it as a sandbox survival game.

if you cannot set your own goals yourself, or need alot of handholding then you will find it boring and lonely. much of this game emphasizes on self discovery.

there are options to track and remind you of what is needed to do.

and if you missing some item to craft or don't know how to craft or find a resource, u can set it to be tracked and the game will assist you as much as possible. the actual finding you have to execute yourself.

very little. maybe 30-40 hrs only. i dun have much time to play lately.