I can attest that keyboards are an extremely personal choice - there are intense emotions expressed on other forums about precise weighting differences, etc.
To me, I would in no way want the keyboard on my Rev2 any *heavier* or *stiffer* than it already is - it's one of the more stiff feeling synth action keyboards I have and that's not, in my opinion, a good thing. On the other hand, because it's stiff, I do find it very suitable for parts one would typically hand a weighted board - such as DX7-style electric piano roles.
To me, it's a perfect compromise between a semi-weighted EP-style keyboard and an unweighted synth-style keyboard, not perfectly light for shredding or organ, but neither perfectly weighted for piano-style classical playing - a goldilocks in-between that suits a very wide range of playing styles and stays true to the synth intentions of the board.