I just checked his statistics. In PL he has 50 goals from 142 appearances with 120 shots on target. Which is in fact a great rate of conversion.
This is true. I supposed my disgruntlement comes from the fact that since he is one of the most (if not the most) potent goal threat we have, when he misses chances I always feel there is a likelihood we will live to regret that. This might be due to a general team issue where he haven't been creating enough chances, or even taking them, in recent years leading to results such as this one.
I might be taking the frustrations I have regarding the team on him.