Yes, totally. And also some of its stylistic offshoots like Gaudi.
It seems to me like it was the first really original style since Gothic, that didn't fall into the trap of just re-using elements of classical/gothic style. And it was still so focused on being decorative that it didn't fall into the trap of being simple and a bit boring like a lot of the other styles. I think the other one would be Art Deco, but nouveau has an alien kind of look to it that nothing else does.
I'm waiting for it to make its comeback, I suppose it's been 100 years. Get ready for it