Why isn't it musical? They have low distortion, flat response (anechoic and group plain), adequate boxes. Time doesn't mean you have a better grasp of something. As a matter of fact, over time you desensitize to your surroundings, especially speakers.
Claims are claims. I've claimed to have a 15inch dong, but you don't see me eagerly trying to prove it. The fact that you heard other claims about it not being musical, is enough to push you to that opinion. Until you have proper comparisons done, I would stay away from the "BUT was NOT very musical at all" statements.
SheepStar