Would you prefer colorization of B&W films if done well?

I do not have anything against it in principle, so long as it is made clear that it is not the authentic version. It is just that I have not yet seen one where it has been an improvement. But that maybe because I am not big on the genres where it might be an advantage, like (as you suggest) musicals, or westerns and outdoor adventures.

I have seen several colored movies which might have been better in monochrome though.