I agree, Halo Reach had forge which was awsome and that came on one disk. The Editor is absolutely possible
As has been said, there is no financial incentive for Bethesda to create something similar to Halo's Forge because TES is a single-player game, and Halo is a multiplayer game. Bungie wants gamers to continue to play Halo Reach online (the player-base creating new maps every day ensures this), while Beth wants you to play their game, buy the official downloadable content and expansions, then buy their next game.
It'd be nice to have, but
it would be a massive waste of time, energy, and money on Bethesda's part with no gain for them.just so i know what does the contruction set have that halo reach forge wolrd dosent have. im not trying to be arrogant i honestly don't know i only play games on a 360 not a pc obviously some stuff will have to get converted like putting a person or a bear in instead of a tank but what does it consist of
The Forge and the CS differ on so many levels, it wouldn't be fair to list them all here.
In short, Beth's CS is used to design a whole freakin game. Forge is not.