I keep seeing complaints that Galaxy City isn't a good tutorial compared to the others and while it's not very informative on it's own, we need to remember that it was not intended to be the end of the tutorial. As soon as you load into Atlas or Mercy you're directed to Matthew Habashy or Operative Kuzmin whose arcs (and those of the contacts they introduce) continue to guide the new players along, slowly introducing them to new mechanics. Then, you're automatically introduced to Twinshot/Dr. Graves, who give you yet more mechanic learning missions. All these arcs are also quite cinematic compared to the standard blueside/redside fare, since they were all created at the same time as the Galaxy City revamp.
All those contacts are completely skippable. I can't remember the last time I ran Twinshot because I don't need the information. But it's there, there's a great big pop up when she's unlocked that I ignore every time I hit level 5, and it's still part of the tutorial that the Paragon Devs gave us the ability to skip by dropping us in the open world that was already there.
Just wanted to point out that Galaxy City is not the end of the tutorial, but rather just a climactic beginning.