I've been silent for a while, and I plan to still, though I just want to say one or two things. Despite them being said again, and again, and again by others in different ways.
To me, I figured before even GT4 was ever in my hands, try as PD may and will to appeal to many pepople, be it in Asia, Europe, Americas (North or South), and anywhere else in between and beyond, you ain't gonna please everbody. Not every song is for everbody and then some, some songs people will like, the same can be said for those others absoultely hate.
For me, I like a few songs in the soundtrack, most of the stuff... no wait ALL of the stuff done (or Remixed or whatever) by Daiki Kasho, as I loved his work in GT3, I also like (Call me) Super Bad remix by James Brown, I felt they should have left 'Born too slow' though it's a good remix, I'd prefer the origional, my own opinion on the matter, then there's Machinegun, Nitro, Mr Gameplan (I think) and a few others. Some songs I'd prefer not to have but that's what the playlist options are for.
They try and I think they did a decent job, plus who is to tell what is good music or not when the crap is subjective to no end? I mean, think back to GT1, when (at least for me) a number of us were at an age where we were prone to influence. It's beause of just when I started playing GT1, that I still think Lose Control by Ash is THE best song from GT aside from the works of Garbage (As Heaven is wide and I think I'm Paranoid), Super Bon Bon by Soul Coughing, nearly all the instrumentals in GT1, andd yes, I like to almost death the American intro song of GT3 by Lenny Kraviz, say what you want, I don't care, I like that song a LOT.
It's all subjective, if someone dosne't like it, well they don't, maybe they should give it more of a shot, maybe not, it's their choice. all one can do is to suggest and not the 'suggest' as in have a gun to the back of their head suggest, but just to say 'hey, maybe you could try Machine gun' or 'Strike Barrier' or a number of songs.
GT4's soundtrack is it's own, I like it for it's variety, I like it because it tries, say what you want of whatever specefic soundtrack be it from Asia, Europe or America... a few songs I wish were on there such as Dream Snacher, Live in a Box and Hell above water, but one dosen't always get what they want but they got what they can use.
Plus I could always just put the music on mute for a while and play what I want on my computer

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That's just my take on it, I'm bound to overlook crap like usuall and once more I'm over lengh again from what I promised to say. But it's just me, don't expect me back anytime soon but like anyone really cares or so I think anyway.
Later...