I can use the medium grey silicone, and push the tips in just deep enough to grab the wall of the ear canal and seal where outside noise goes away, and the bass will not be boomy, mids are full and highs are sparkly. If I push them in a few extra mm deeper than they need to be then the bass becomes boomy and highs roll off and mids fall back. So, a short tip too deep is a problem.
But if I use a triple flange tip the tip bore length is too long, and the highs sound plasticky unless I shove the tip much deeper into my ear till it is uncomfortable - if I trim about 3 mm off the stalk of the triple flange, and use a shallower insertion the sound is right again, and comfort is improved.
And finally, if I use custom molder Westone UM-56 tips, I get the same ear position everytime, and comfort/isolation is high, with a good balance of bass/mids and treble.
So, we know the W3 is capable of putting out excellent sound, it just doesn't seem to work as well for everyone universally. Most people can make it work after not only trying all the tips (or ones they didn't come with like Shure black olives or yellow foamies) but also by altering the depth and position of those tips. Each tip will have a particular ear position that works best with one person's ears, and that position might no the best for the next person, even though it is the same tip.