Yeah its free and all and the client is huge too, but i didn't liked the graphics and i didn't like how you control the ship, though simulator purists might find it too arcadey, i on the other hand found the ship controls confusing. And yes its a huge world to explore but there aren't any interesting quests to warrant the exploration.
I'd give it a rating of 2 out of 10 for being a poor game, sorry its just my opinion