So as interesting as the Blackwood expansion is -- it's not my absolute favorite of the DLCs because that will always be Thieves Guild, but I still enjoyed it -- I was a lot more fascinated by the new tutorial/start zone. In terms of ESO story, it's pretty generic, but I like that it lets you choose to start out in one of the older DLCs, or in one of the Alliance starting points, if that's what you want to do. It's a nice way to manage where you start, instead of doing what I normally do, which is hit the boats and shrines, ignoring everything until I get to the zone I want.
That said, if I could reshape it any way I'd like, I would further tweak it so that when you choose the starting point it dumps you into that starting points starting area -- only a reworked starting area that took out all the "learn the game" bits and made it more of a "starting delve". There were parts of the starting areas in some of the DLCs I really liked, story-wise. I liked the intro movie for Elsweyr, and waking up in the monastery and the idea of having to fight your way free, encountering the dragon, encountering the disgraced monk who becomes somewhat more important later in the story arc. I *really* liked the intro movie for Skyrim, and meeting Fennorian in the cell and the mini-arc where you disrupt the proto-harrowstorm -- I think that's one of the strongest openers ESO did. The Morrowind one was pretty fun, escaping from slaver island, and it makes the mission where you get sent back a little more in-game satisfying.
(And thematically I like the idea that you wake up in prison in the starting area (because it's the elder scrolls, it's practically a contractual obligation at this point) then you choose a portal to go somewhere else... where you might very well wind up in prison again, and then you're bopping along until you activate the vestige storyline... at which point you wind up in prison AGAIN...)
... actually, if I could do one thing, I would tweak ALL of the starting areas so that you always start in prison. Yes, that's absolutely what I'd do.
That aside, the new tutorial zone is a nice efficient mechanism to give a new character access to any of the starting zones the game already has, and I'm glad they created it to accomplish that. I'm not super jazzed about the new tutorial's story, but it has to be generic enough to accommodate the trans-Tamriel gatehouse at the end so I'm not really opposed to it either.