Not many of those things are that useful bits of info. how fast someone dribbles is irrelevent. Jay Jay Ococha was the king of dribbling and he wasn't the fastest dribbler. How skillful it is is pointless as the aim is to beat your man. Kaka didn't do tricks but was a far better dribbler than Martial as Kaka would weave through teams. I admit the length of the dribble, difficulty and usefulness is important. The thing is that most the players I listed are attacking players so they are going to be receiving the ball in similar positions, doing similar things with their dribbles, attacking similar congested areas. Its not like they are just dribbling round in circles at the centre line.
Look, stats will never give the full story, but you nor I have time to watch every single player in every single match so it can give us an indication of activity. I hate when people say stats don't matter. We know Robben is an insane dribbler, far, far better than Martial and it is reinforced by his dribbling stats as he is far more successful. I know Neymar is a superior dribbler to Martial and again, 'tis backed up by his dribbling stats.
seing as Martial pretty much dribbles down the left flank and on the byline, I know how long his dribbles normally last approximately. I also know how useful they are. he is very good dribbling inside the box and on the byeline. He usually beats one man and occasionally 2, but rarely goes on these long mazy dances like Robben. Martial is more a man you give the ball to feet near the box so he can cause havoc, bar that time against west ham, when he did carry it from far. He isn't the guy you give the ball in your own half and he is going to race you down to the other end of the pitch.
Fact is there are far better dribblers. Martial isn't even the best French dribbling wide player. I would say Payet is superior, to name one.