I find that most mainstream products also have problems. You see, I came from the MD world only about 3 years ago. They were chunky, metal and bristled with buttons of all sorts. When, in the middle of the worst iPod bashing, I discovered that MD was too hard to keep up when on the road, I bought into Cowon and Meizu - one mainstream and one decidedly not. The Meizu had a more pleasing sound, but it hissed. The Cowon operated better (sort of), but lacked so many things that a cheap, run of the mill MD/CD player had.
The argument that SQ is ethereal and personal in nature is silly - these devices HAVE to measured by some metric, otherwise they the 'SQ' moniker remains the analog of 'I like cheese because it tastes greasy'. Grease detractors will disagree. So too will the masses who prefer another sound.
So while saying that I would PREFER a mainstream device might be true on one hand (I'd love a device that brought the same level of commitment of actual music playback as a CD/MD device), I know I won't find it outside of a jumble of hoops. iPod currently is the only line that allows me to hear my music as it is recorded. Rockbox is another, but it has to be played through ancient players with loads of hiss, bad roll off, poor stereo image, or that are impossible still to find.
The Fuze is one of the most mainstream players on the market and came out a couple of years after Sansa did their whole 'iSheep' thing where they made fun of Apple for designing clicky wheels, proprietary connectors, fiddly nipples, and having a group of sheep buyers. At the same time, the OF Fuze doesn't have a good EQ (albeit a bit better than the stock Apple one), lacks gapless playback, hisses, 's got loads of grain in the midrange, bristled with proprietary cabling and poor USB charging and sports a fiddly nipple.
My trust of the mainstream is at an all time low now. On the one hand, the Fuze plays low Ω earphones pretty well, but it sacrifices image width and raises hiss. On the other, it is fiddly. In the mainstream, there really is only one company that caters to the music lover (and one could argue that the music lover is audiophile). That is Apple. But they do everything with skeleton severity - no EQ, no effects, pure performance with very little added sound signature. I understand why people hate them, but at the same time, I laugh at the assumption they sound bad.
I'd love the Gumstick to have a workable GUI and gapless playback and AAC. Sony have everything but hiss and gapless nailed. But they're Sony - they'll never fix those issues. Microsoft are completely proprietary. Cowon have style, but no substance (very average headphone performance). iRiver have left the building. Chinese players are pushing the boundary for actual sound enhancements at a circuit level, but they do it without the insurance of good build quality and ease of use.
Fighting to listen to music isn't something a music lover should have to do. In the 'old days', music lovers just popped in a CD, tape, DAT, DCC, MD, record, and 'hit' a play button or switched a knob of sorts. Today, to get the same level of interaction between music and person is much much harder and is a process that degrades the enjoyment of music. I don't get it - why in a world where we have every technical advance are amateurs allowed to ford ahead with consumer's money and complaints towed in sky high?