Honestly these are all excuses, not for Martial, but for the mistake of judging how good he would be.
Unlike a lot of young players, Martial has had the opportunity to play for one of the biggest clubs in the world and didn't have to have seasons of absolute class like a guy like Grealish has had to do. Most players do not have the opportunity to consistently play for a team as good as ours prior to turning 26, Bruno didn't. Yet you have people here making the excuse that his lack of form has to do with our dysfunction...if that's the case, how do any players from teams below us end up with great performing seasons?
It's the issue I have always had with us hyping Martial. Would Martial have been a player we would have signed if we had let him stay at Monaco? The obvious answer is no. Why? Because even when granted with the opportunity to play with players at the level of ours, he has never truly produced anything outstanding, tbh not really even good outside of last season. When you take in the fact that he has been here since 2015/16 with poor inconsistent seasons in 16/17, moaning about competing with Rashford and being off form in 17/18, terrible in 18/19 and this season's woes, how can any one say he will come good when he's never shown that.
Rashford is two years younger and has managed to improve from year to year, even carrying us at times and having to take on the responsibility of being our most dangerous outlet at such a young age. Goals don't even begin to explain everything either. Rashford has always tried to drive with the ball and make something happen. Initially, in 16/17 he didn't have the technical ability to have any real end product and even his dribbling was uncontrolled, regularly leading to dispossessions; this was the time Martial was better than him, as even though both barely contributed and our team was relying on Ibra and Pogba almost completely ( with moments of magic from Mhiki and Mata), Martial barely contributing but having one nice run in a couple of games was still better than rashford killing attacks with poor drive attempts and poor touches. in 17/18, rashford's dribbling improved, he now had moments of controlled dribbles, but his touches were still off which meant he could only drive in situations with open spaces. This was the year he also showcased his shooting ability, but was a tad bit too selfish in taking them. This is the year Rashford overtook Martial, as Martial remained stagnant. 18/19 was generally a bad season for us, but rashford continued to develop his dribbling and significantly improved his touch, allowing him to be a much more dangerous threat in the final third, as he could now dribble laterally across the byline, in addition to cutting in, adding an extra dimension to his attacking game. This was the first year in which rashford could now be deemed a real attacking threat the could destroy teams with his pace and dribbling. Martial still stayed the same, having one or two great dribbles in 10 games and then fading away whilst Rashford, although a tad inconsistent, was now one of our key players rather than an x factor. 19/20 came and prior to Bruno coming, Rashford became our best player. The team was inconsistent, but relied on Rashford's magic moments, resulting in lots of penalties due to his singular threat. In addition to his shot, Rashford added key passes to his technical toolbox and in all his passing in the build up play improved significantly. This was a relatively good season for Martial. As a striker, the spotlight was no longer on him for build up situations and his short bursts of dribbling ability and composure in finishing situations could be highlighted as a striker. He was still inconsistent, and for me this was based on inconsistencies in his game, rather than mentality. I personally don't feel Martial has the large range of attributes required for a successful attacker threat and unlike Rashford has not developed any additional skills to make him that. Since 19/20, despite not scoring many goals, even Greenwood has developed significantly. His build up game is fantastic for an attacker, he can hold and release the ball in tight situations, his touch is good, he regularly makes the right decisions when on the ball, he has a decent passing range and he can dribble his way into good situations and out of bad ones...all in the space of a year, whilst Martial, who is now 25, still hasn't made any improvements in his game. Going back to Rashford, alongside Bruno, he and Pogba are the players we class as world class or at least close to that in the team. Martial on the other hand still displays the lack of workrate or attacking movement that has made him so ineffective for us over the years. Lukaku may have lacked a good touch, but he had the tools to make himself an effective and consistent weapon for us and he's continued to show that at Inter, regardless of our fans not liking how he looked on the ball or his attitude when he was leaving. Mentality explains the lack of improvement, but his lack of quality ( limited attributes) is why he has proven to be consistently ineffective, people just haven't gotten wise to that yet.
Barca are not a good club to be compared to, in terms of finances.