It literally took any semblance of choice away from the main quest.
"You thought the Enclave would be a better choice for the CW? Nope, you were wrong, get back to helping the Brotherhood." /stare.gif' class='bbc_emoticon' alt=':stare:' />
Broken Steel is why nothing like it will (hopefully) ever be made again. Unless they come up with some way to display every single ending possible.