I personally feel that Halo 4 forge is a massive let down, comapared with Halo Reach.
Don't get me wrong, the interface is exceptional, but what I'm talking about mostly is the maps that you can forge on. There are no large open areas to build a massive map with, not like Sandbox anyway.
With Sandbox, I blocked off the laser towers with walls and it opened up the whole outside of the map for truly giant maps (Which had every vehicle scattered about, and it was still difficult to get a vehicle.
I read somewhere that restrictions on map sizes might be in place, with the increase in graphics and textures and all that junk, so maybe it might not be possible for a big map, but I think Sandbox would be ok, as it is fairly flat and not much back ground at all.
So please show your support here to get Sandbox back and hopefully some one will notice and maybe get things in motion.