If you think Man United have fallen under difficult times and risk relegation if they don't perform satisfactorily next season, then I think it's safe to say Man United is now worse than Arsenal.
No, I don't think Manchester United will be worse off next season and potentially relegation from losing to 19 other teams. That's hard to justify even though at the moment Manchester United are not playing as expected.
They have not being able to make fans happy due to poor performance but then, who should we blame? The coach, the players or the management? I feel they are just going through a rough patch.
If they want to win the title and have good competition in the top 4 then they have to recruit the right people. It is not good to expect success to be achieved with minimal team quality while others continue to improve the quality of the team every transfer window. What Manchester United expected did not match what they did, that's the problem.