Yes, there are issues in terms of defence, but between coaching and the transfer market, those have fairly obvious solutions.
There is a collective mentality shift needed after three seasons of failure in the Premier League, but Mourinho is well placed to address this, and the FA Cup win at the end of last season will help with that.
There are questions about some of the fringe players and whether some of the youngsters will be given the chances they need to develop. But the squad is in decent shape, and Marcus Rashford's talent is undeniable, so at least he will surely be given the opportunity to thrive.