One thing I am pleased to see is the 'fall off the platform' effect that plagues JSW2 (Spectrum) and MM + JSW (Amstrad) is thankfully not present!
By this I mean if you stand M.W at the far end of a platform and press jump then attempt to move left/right you simply fall off rather than jump in that direction. The Spectrum version of JSW1 and MM behave more sanely (imo) in that regard. Lost far too many lives in JSW2 by this.
Realise the answer is simply to stand one frame in then operate the controls but with timing sometimes critical its not always easy to retrain my mind for this.
As I say thankful to see this 'effect' is not present. Although I've not looked into the cause it seems almost as if the left/right vs jump keys are tested in the opposite order.