It was a very exciting finish... those last three holes really set the stage.
Justin Thomas was bound to win a major sooner or later, actually picked him earlier in the year in one of the contests, he was playing great golf. He just had a great week on the greens overall. Putting usually ends up being the difference, and it doesn't hurt that pound-for-pound he hits the ball as far as anyone else. That par3 17th played 221 yards, and he hits 7-iron to 10 feet, makes the putt? That's just insanely good.
I must also add... I think above and beyond the major championship aspects - the US Ryder Cup teams look very promising going forward. Jordan Spieth, Bud Cauley and Rickie Fowler were there at the end to congratulate Thomas for his win, which is fairly representative of this younger generation of players and is refreshing to see. They obviously want to win individually, but they also appreciate their peers' success. It helps form a tight-knit group (something that we've often lamented that has been absent) in Ryder Cups of the past.
You can never discount the Euros and the tenacity with which they play in these team events, but these developing relationships with our younger players bodes well for future Ryder Cup success imo.