You're confusing the better experience of going to the match for some magical better vision of how a player plays.
As I say unless Mascherano was scoring goals off screen, tackling players off-screen, or making passes with a different ball to the one the cameras were following, you just didn't see that much more than me.
As I say I've been to plenty of games in my short life (None this season, granted) and my judgement of a players performance doesn't differ much from when I'm at the game, to when I'm not.