Reading their forum it reminds you its all about perspective. We can look at it with the bigger picture as we are more concerned with following his long-term development as a player, whereas Leicester fans understandably don't care about that they just need immediate results for their club.
The only criticisms you could have with him today are excusable;
'He didn't get involved enough', Ok hes just made his debut in senior football with a team he has been training with for less than a week who play a completely different style of play than he is used to. Give him time to work his teammates out and vice-versa at least.
'He is lightweight', No shit, he is 19 years old and has plenty more growing to do over the next few years and will gain more strength in the future. He has always been a bit behind his peers physically. However this isn't the nfl, his pace, skill, awareness, technical ability, intelligent play and movement have always been his assets and these are far more effective traits in this sport than strength. Even in the short periods he got on the ball he showed these qualities. He is a creative midfielder not a target man.
If Leicester can get the ball into his feet quickly and have good movement around him he can bring class to their side and hurt teams and be of a benefit to them. He is a big talent and i'm sure that if people show patience with him he will prove this.