Why Does Pogba Always Look Unhappy at Manchester United?

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I'm not a fan of Manchester United nor Paul Pogba, so I don't really watch their games. The only time I find myself watching their game is when I bet on them (especially live bet). I prefer to watch the games of Manchester City, Liverpool and Chelsea

Let's put that aside

Looking at the aura Pogba carries on the pitch, you don't need to be a fan of Manchester United for you to observe that he doesn't look happy being part of the team, or maybe I should say he doesn't look like he's fulfilled being in the club

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Before he came to Manchester United one would think he will get to the apex of his dream at United. One would think he was coming there to do a good job, improve the team’s performances and bag some individual awards but none of that has happened. He never even came close to that

Don't get me wrong, I'm not trying to say that Pogba isn't a good player. Of course he's undoubtedly a gifted and talented player who has only been underperforming at Manchester United. However, a lot of factors contributed to Pogba ill luck at the club, so it really his fault that he didn't have a colorful career at United and maybe that's why he has been always dreaming of being at Real Madrid

What's your take on this?