I just would like to know what everyone thinks of sandbox and if it is good or not, because I don't have enough money to buy them yet. So please just tell me if they're even worth it. thanks
I don't think so. I don't really forge as much, so that may be the reason. If you want to forge an amazing map, I'd buy it. I don't think it's that good for gameplay, either. Don't waste your money.
Then buy it. If I were you, I'd go to a friends house and play Sandbox on their Xbox first. See if it's any good.
Buy the Mythic Map for the other two, even if you don't like Sandbox that much. Assembly and Orbital, even in their default forms are some of the best maps ever.