Why are you making up bullshit criteria in order to try to boost your argument? Who cares about leadership or the national team? Sorry, but that's silly.
I don't think you can class Mount as a 7/10 signing just yet, but labelling him a 4/10 isn't valid either.
The injuries aren't the player's fault. He was also injured all season just in the first year of his 5-year contract.
He cost £55m, not "£60m+". ETH really wanted him, and there was no guarantee that he would join us on a free 1 year later. The fee is also arguably reasonable. I don't think there are many, if any examples of a player of Mount's quality and status within the game switching clubs with 1 year left on their contract for much less than 55 million.
"No obvious position/role in the first XI"...okay, first of all, you don't know that. Secondly, you have to think about this in terms of the whole squad. There are a lot of quality players both at City and Arsenal (whose levels we are currently aspiring to reach) who don't really have a set in stone role or place in the starting XI, and yet they are very important for their sides, and get a lot of play time as well, both as a starter and off the bench.
Considering everything, you can't judge the signing yet. He barely played, but whenever he did, he was alright. It's also pointless to judge any player based on a season like last one. Not many players can perform in a dysfunctional and struggling team like 23/24 United. Some of the best players in the world currently from other teams would've looked like Championship level players in last season's side. You can basically act as if that season never happened when assessing any particular player. It's an x/10 signing, and we'll find out later what that number is.