Being able to see Euston doesn't get you into it though. Unlike St Pancras which has access at both ends, you're forced to go almost all of the way back to Euston Road in order to access the entrance. Walking along Eversholt Street is also a reminder that one would like to see as little of Euston as possible, it's an eyesore. Then you've got to walk all the way from Euston's infamous concourse to your carriage which could be 250m back in the direction from which you came.
If you could just disembark from your carriage, go up onto a bridge (and I mean a Reading-sized bridge with individual gatelines for all platform pairs, possibly on both sides) and walk straight off onto Phoenix Road, it would save half a mile of doubling back and might relieve the pressure on the concourse at Euston by giving people more places to wait for their trains to be called, places that might be closer to the end of the train they wish to board.
A bit of daylight might cheer the place up too.