I think it is more in reference to the character than Michael's acting. If you consider the dynamics of the characters... how they play off each other, then in the first Act, Andrew is the dominant, stronger character in terms of his control and power over Milo. Andrew confronts Milo about his affair with his wife; thus resulting in Milo indeed being a tad sheepish and Andrew having the power. Later, in Act II, the dynamics shift and Andrew has the more dominant and powerful role... so it balances it out and we see both characters - and subsequently both actors - taking stronger roles at different times in the play. It's actually very cleverly done and I think the way both Michael and Simon play off each other in this way is superb.
Just my thoughts of course... but I think that's the angle the reviewer was probably coming from.
Sorry this has spoilers in it but it's the only way I could think to respond to Celeste's question/point.
Haze x
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