In one game, Mesut Ozil could supply a plethora of goal-scoring chances, provide a hat-trick of assists or even score a decisive goal himself, however, in other matches, Arsenal's record signing - a £42.4m acquisition from Real Madrid - may be anonymous, with a dip in form hounding the German international from the New Year onwards.
Ozil's team-mate at Arsenal and for Germany, Per Mertesacker, has appraised the trequartista, lauding the 25-year-old as a "fantastic player" but stated that in he must become more consistent on a game by game basis - something he had every confidence his friend could do as he is an "intelligent footballer".
Mertesacker told Arsenal Player on the club's official website: "It's very important to understand the differences between the leagues. Mesut came from La Liga and it's quite difficult to play there. I think he has adapted well but there is more to come from him. I think the second season will be much better for him because he's a fantastic player."
Of course, acclimatisation can be a factor, particularly when transferring from one elite league where there is a mid-season break to another where football is played for the whole season and, in place of the break, there is a period of fixture congestion.
Ozil has also been utilised in a different manner by Arsene Wenger than he was when coached by Jose Mourinho at the Estadio Santiago Bernabeu. Ozil is relied on more heavily by the Gunners and has played more than 80 minutes in 30 of his 37 appearances in all competitions. Last season, in La Liga, eight of his 32 appearances were for 80 minutes or more whereas the rest were 60-minute cameos or less.
"He has shown some great skills but he needs to be more consistent, which makes a difference at the end," noted Mertesacker, 29, before calling on Ozil to address the flaws in his game. "Sometimes it's good to get criticism with the negative points… if you are intelligent enough, and he is an intelligent footballer. I think he will sort that problem out.
"It's similar to myself when I got my injury in the second part of my [first] season, and after I came back even stronger because then I realised what is at stake.
"I think for Mesut it was good to get a little rest to be ready for the last few games for us, then the World Cup and then another season. I think with a pre-season ahead of him, there's more to come from him."