For a start there is a problem with the players you have mentioned here. The first 2 are 2 of the greatest defensive midfielders to grace the Premier League era, both having the obvious benefit of playing for title winning teams with vastly superior teammates. The third comparison with Gareth Barry is not fair either because Barry is a different type of midfield player to Gana, but was also a league title winner.
I don't know how you can watch Gana and not see what he brings to the team. If you're purely looking for exceptional ability on the ball, goals, crossfield passes etc then you're obviously not going to get that with him, but that's not where his strengths lie so it is pointless for the fans to expect it of him.
What he does exceptionally well is prevent opposition players from having any time on the ball. Similar to what McCarthy brought to the team in the 13-14 season. He makes interceptions, blocks, tackles, prevents opposition counter attacks, covers the defence when needed, 'runs round a lot' which is actually a positive for someone in his position even though the suggestion will probably get laughed at. These are all attributes that help the team as a whole. And obviously he is more limited on the ball than someone like Barkley but that is why each player has a different role in the team. You need players who can stop the opposition as much as you need players who can get past the opposition in an attack.
I thought he had a poor game by his standards on Saturday, as did Schneiderlin. But I also noticed the crowd in their desperation were getting agitated by backwards passing because everyone was so desperate for us to get back in the game. There were times when Schneiderlin had no realistic option but to play a backwards pass in order to keep possession and loads were going mental. Just because we're losing doesn't mean Gueye and Schneiderlin will turn in to Messi and be able to fly past players and bang in the goals. Their passing game relies on keeping hold of the ball and giving it to better players. Barkley could learn a thing or 2 about this and is why he's never kicked on as a player because he tries unrealistic things in unrealistic situations and loses possession easily.
Of the 2 i'd drop Schniederlin at the moment. Davies has to play.
Yes, I've picked a few examples of top class players, but if you listen to opinions of some, who are saying he is far and away our best player, the best midfielder or DM in the league, better than Kante or other such players because his stats prove it, etc. So why is it unfair to then compare him to other great players from the past?
You say it's not fair because these players played for teams winning titles, without considering that these teams won their trophies because of said players, and if Gueye is as good as he's made out, he should be held to the same standards. If he really does stand out as much as you say he does, he should be taking games by the scruff of the neck, controlling games, having actual influence on them. But he doesn't.
I can watch him and not see what he brings, because he is a defensive midfield player, and in a team that is set up defensively, with lots of defenders, 2 DMs, defensive tactics implemented by a defensive coach who used to be a defender, we are still alarmingly terrible at defending. I can watch him and not see what he brings because he is a defensive midfielder who allows 20 odd yards of space in front of our defenders for players to run in unopposed. And these are the things he's supposedly there to prevent.
I'm not expecting him or Schneiderlin to turn into Messi, but I'm expecting them to do the minimum required for defensive midfielders, and protect the defenders. They don't need to do more, because we have an abundance of supposed creative players.
But that's what baffles me when people say he's far and away our best player. He has one role to do, hasn't done it very well, doesn't offer much more than what he is supposed to be employed to do, doesn't influence games, and then wins the stats even when he Clearly has a poor game.
Like I say, Im not saying he's awful, he's not Claus Thomsen level. But he certainly isn't Arteta level, or even Hutchison level, but people go on about him being our best player, and he really isn't.
P.S. Coincidentally, Phil Neville was often our top Opta performer. That tells you as much as you need to know about stats.