Goals - xG = +0.07 this season (slightly more goals than xG).
Just wanted to drop that in there for people complaining about finishing. He's a decent finisher, even guys like Ronaldo don't outperform their xG significantly.
There are ways to dice that data, you can compare different situations like 1v1s, long range, angled finishes etc. and he might be weaker in some areas than others.
No one, except for Messi, consistently outperforms his xG over a prolonged period of time. There are many reasons as to why this occurs but they are neither here nor there in the context of this thread.
I also believe he's not a bad finisher. The way he finds the corner while running with the ball at full speed is an absolute joy to watch. These were not easy chances, yesterday, no matter what people say. Almost in all of them, he has a single corner to aim at. He doesn't mask the shot, either, when he's afforded a short window of opportunity to shoot. He places his body very early for the shot. The keeper knows where the ball is going, the defenders, too, as well as the 70000 spectators in the stadium. That's probably why he went for power. The header against Newcastle doesn't have to do with his heading ability (which is questionable), it's a difficult goal to score to begin with.
He's rejuvenated and lively, which is good for the team. He was a combined npxG + xA of 0.55, which means that he should either be scoring or assisting from open play in every other game. Which is a very good return for the player and the team, if he can keep it up. The team works to release early balls he can chase into space, and he also feels confident and more alert to what is happening around him.
The xG is a bit concerning though. Not because he's not over performing it, but because it's generally low. Most models tell us that he shouldn't have had more than the 3 league goals he has scored. But that's an overarching problem, not one that has to do solely with Rashford and his finishing. You could see it yesterday, too. When you make Spurs look like a pub team, you shouldn't need a wicked deflection and rebound from outside the box to win the game.