I'm with JDW on this one. I don't think it speaks negatively of the wood or craftsmanship, it's just the properties of the type of wood used.
I have two pieces of amazing furniture, made from incredibly figured wood, dried for longer than I've been alive, worked by true craftsman that are sadly more and more rare with every passing day. The one table, reflects like a sheet of glass, but isn't perfectly smooth to the touch. I can feel the grain 'waves'.
If anything, it may speak to why specific grain patterns are more widely used than others, even though your fiddleback and other various curly grains are really pretty.
