I disagree but of course your opinion is as valid as mine. Not sure where you get the "four times" from, however, and if you think Martial can get anywhere close to Ronaldo's tally, I'm afraid you are fooling yourself.
Martial could not get anywhere close to 18 league goals if the whole club focused on him as the #9 striker and started him every game? Not even like 10-15 goals?
You realise he scored 17 in 2020 while playing on the wing most nights?
That's the problem with going full Cristiano in every game, as the lone striker, give him all penalties and freekicks, concentrating all attacks on him.
It leads to him ultimately scoring some goals and for every argument against him, there is a supporter answering '....but his goal tally'.
I mean those 18 league goals are not even that great, considering all circumstances. Would another of our squad have done the same? Who knows, but he wouldn't even have needed to, because there would be the possibility to play a team game if you are not centering the whole team around Ronnie.
His last season saw him contributing to a goal every 115 minutes, in all competitions.
Rashford the season before? 115 as well, despite not playing at CF most times. Cavani? scored every 95th minute.
The year before? 102mins/point for Rashford, 101mins/point for Martial.
It's not like Ronaldo has done something unhuman this past year. It was, in fact, a pretty average strikers performance.
And yes, I'm completely sure we wouldn't have been any worse if he didn't sign here. Those abysmal 57 league goals would've been easy to match for this team +whoever else we would've bought instead.