Henry - see CSTH's post which I think is a
great explanation for how and where vision was lacking, even if some parts ended up successful.
To build on it:
Here's the question that was asked.
What should replace an ugly road that rips through downtown?
Here's the way that question was answered.
A nicer road, obviously. One that's better landscaped, more park-like.
Some of you may remember the Museum of Science's Big Dig exhibit before and during construction. The centerpiece was a 3D-rendered (quite nifty at the time) animation of how the Greenway would look - from the perspective of a car's windshield. Yes, a peaceful, bucolic
drive to contrast with that hardscrabble congested artery that everyone hated.
So it was going to stay a road. But it wasn't just a road. It was a 6-lane road. A collector-distributor highway "SURFACE ROAD" as the overscaled street signs so prominently signal. But it wasn't just that. It was also La Rambla! Oh, and not just that. It was also a horticultural showcase! Oh, and not just that. It was Boston's answer to the National Mall, a collection of not-for-profit cultural institutions! (How will they afford to build over complicated ramp parcels? *Shrug*)
In the early 2000s when the Globe came out with a long article on inspirational great streets from other cities, and they took La Rambla as a model, I knew the visioning was all off. La Rambla is a natural directional ramble, from the heart of Barcelona, past the Latin Quarter and smack into the waterfront. The Greenway is a non-directional corridor, parallel to the waterfront but mostly without the harbor view. (Like it or hate it, Boston's real La Rambla has for the past several decades been the South Market side of Quincy Market... I'll just leave that there for now.)
So they wanted to GIVE a raison d'etre to a corridor that nobody would naturally walk. They had to fill it with "things and stuff." But "things and stuff" isn't really that important, and moving traffic IS important, so we can see how that worked out.
But let's be clear about something. Of course some "things and stuff" work spectacularly. The carousel, for example. But it's not a great part of the Greenway corridor. Actually, it's a great part of the Quincy Market --> Long Wharf corridor. A great moment along that natural ramble. You see? The natural movement for the area that replaced the elevated artery is one of being traversed - not strolled. So yes, Henry, there's enough stuff now to see that you CAN stroll it, if you wish (and if you don't care about overscaled 25 foot high traffic signals, interstate highway signage and spaghetti ramps)... but still, was making it a corridor to stroll really a worthy goal?
And let's say, for a second, that we really needed all those ramps, and that nothing could easily be built on those ramps, and that nothing could easily be built anywhere over the tunnel for that matter. Even in that case, nobody looked around and said - hmmm, six lanes of surface traffic... what about just four lanes of traffic and a heritage trolley? A GLX to tie into the seaport? Hell, even some dedicated bus lanes to make NS/SS transfers all that easier?