I certainly wouldn't call it smooth. The game has been delayed, plus the "multiplayer experience" that was supposed to come last summer never materialized. It was pretty clear at that point that they were pivoting to Scorpio. Also, the recent Shinobi tweet confirms it hasn't been smooth. Again, probably some of that is from changing systems (One to Scorpio; but it can still run on the XB1).
It was probably announced too early -- as MS was lacking games at the time -- and it's clearly had some trouble getting going. I mean, think about it: we haven't really seen "official" footage for it. There have just been closed-doors demos of the tech, and then there was off-screen dev footage at Gamescom two years ago (with a tiny bit of multiplayer footage at the end). It's all been very limited, which shows they're not exactly confident to show it in public. Hopefully that has changed for this year's E3. It would be nice to feel good about the MP, which seems like it could be great, and the SP, which is a complete mystery.