His numbers are pretty good but I do think the way he plays is not that sustainable in the long run for a top team to really challenge across all fronts unless he really ups his output or tries to do a bit more for the team. He's too good to not have some output from the way he plays, particularly being served by Bruno, but I'm not sure his approach means as a whole we're getting the most out of the team. He doesn't really create consistently and doesn't seem to make runs to create space for others.
He's started making more runs in behind this season, although would like to see him do more of the ball running, and has a good understanding with Bruno and does tend to deliver in big occasions. I also do think he probably needs more of a rest than he generally gets which could play a part. At end of the day he's still only 23 so clearly going right direction but as I said I do think unless he really ups his contribution that I'm not convinced that his style is really going to propel us to the next level.
That's not to say he's the only problem in attack. Martial has his own issues to work through as well and clearly not started at the level we'd want him to so far this season. If both Rashford and Martial can pick up their form/develop further in 2nd half of the season, and hopefully with Greenwood finding form as well then it would be a massive boost in us really making a title challenge.