I would be more positive (though still measured) in my assessment. Megwa has had some excellent performances, especially in the away wins at Livingston and Ayr. For someone who is not tall, he is remarkably strong in the air. He shows good skill and movement going forward, but I concede that his crossing could be better (apart from his beautifully measured cross for Macaulay Tait's toe at Livingston!).
I think that he has been a little unfortunate in that his relatively small number of mistakes have been disproportionately punished, especially in the more publicly obvious home games. I am thinking of 2 occurrences at the John Lambie end when his failure to see the ball out led to conceding goals (and to his receiving a tonguelashing from Ashcroft), and of course he played a part in Robbie Fraser escaping to put in the cross for the first Livi goal on Tuesday.
However, he has put in a lot of good shifts, particularly in the away games. Equally it would be going too far to say that he has been outstanding. Maybe we could agree with "whelming", neither overwhelming nor underwhelming?