Yes it was a little nervy but otherwise pretty good. No doubt the Stokes/Buttler partnership was the deciding factor and a large slice of almost science fiction style luck. You had to feel very sad for the Black Caps they played a great game and in some ways actually looked the better side on the day. However, there is no doubt that, when it is firing, the top and middle order of England has to be one of the most dynamic and best in the world if not the best. New Zealand have a great bowling side and to have reduced England to what they were before the fightback was a terrific performance. Don't forget, also, that both these sides beat formidable opponents in the semis. Overall, however, I think England were the best side in the tournament and it can be argued that the only stutter was when one of the star batsmen got crocked with a hamstring. Currently England have an amazing crop of young talent, especially in the middle order and if one or two of those progress as they could then we look set to be in the thick of things for a while. We also have a very good all rounder in Sam Curran and I am hoping he will star in the Ashes. However, the side ought to be picked in accordance with any perceived weakness in the Aussie batting. :) From what I can gather, though, we may not actually be able to field a full strength team until about the third test and by that time we might be 2-0 down. We will have to hope that the numerous injury concerns are overcome.
Returning to the question, yes England played ok but it wasn't their best performance of the tournament, it was just good enough to win which, all things considered, I do believe they actually deserved to.