Of course it is. We can judge his stats based on anything, and we can certainly judge his performances. All one needs to do is watch the matches and take a gander at the chances he misses; at least two solid chances missed exist per match.
Of course there will be those that excuse him for missing easy chances by claiming he's a "4th striker", just so they can (in their minds) hail him as an "awesome" player. But in reality, he's just a mediocre player who deserves to be a 4th striker instead of one who plays all the time.