[arp242]

The default Vim colourscheme has comments in blue, and they stand out rather than fade away. I don't know if Vim is an exception or if this sort of thing was more common in the past, but this always seemed right to me (actually, being designed for 8/16 colour terminals means there probably wasn't really much of an option).

I do have a few lines in my vimrc to make "///" and "##" appear as greyed out; I use this mostly for "literate programming"-ish type of comments, which don't need to stand out so much. It works very well for me, although for other people it looks like it's a "mistake".