are you a musician or just a listener of music? seriously... because yes ultimately the end product is what you end up hearing, but the process is JUST AS IMPORTANT. I hate to use this example because not everyone agrees on the musical value of this band, but Opeth's take on songwriting creates far more interesting output than fucking anything you hear on the radio. Mikael starts with the shell of a song, and the members of the band improvise their own parts in the studio, writing the music as they go, so that as much of the soul of the individual musician is infused into the final product. This can be done in extensively planned out music as well, ala Mark Knopfler's solo material, but when a pop musician goes into the studio, and the song is already written for them, the tracks have been recorded and all they do is sing the lines that have been given them, the final product sounds mechanical, boring and contrived. Not to mention that most pop-singers either a) have extremely boring stock-type singing voices or b) are graced with a technically amazing set of vocal chords but they have no soul whatsoever
My main musical concern is composition. The process/means is/are extremely important to music in general, but not to the actual listening experience itself. Here's why:
Let's say someone gives you an unlabeled CD-R with a bunch of recordings on it. Let's also say that you absolutely cannot find any information whatsoever on the music. Now all the tracks have vocals and other instrumentation as well. When you listen to this music and decide if you like it or not, the process involved in making this music has absolutely no effect on your experience of the music. Unlike the Opeth example you gave above, you cannot say that the keyboardist gives his own particular soul to the track by improvising over something the rhythm guitarist is playing, and so forth. You have no idea how many musicians were involved in the writing and recording of the track; you have no idea who did what; nor do you even have any idea whether something was improvised or not. Even if the recording sounds just like a Justin Timberlake song, for all you know the guy singing it could be the only one involved (wrote the song, produced it, sang it, etc.). In this case you cannot judge the song based on the singer's involvement in the songwriting; you cannot judge on the song based on improv skills; hell, you can't even judge the song based on "technical skill" on an instrument (what if this artist or group of artists is/are crazy good at programming and programmed an unbelievably realistic acoustic drum sampler?). The list goes on, you have no idea if the singer can really sing or not (what if he or his partner is just an amazing producer who flawlessly pitch-corrected his performance?), etc.
The ONLY judgments you can make are: I like the way these drums sound; the singer's voice is a bit annoying; the guitar is mixed too loud; etc. THESE are qualities of the music and THESE are what should be judged. If the attributes I mentioned in the previous paragraph truly mattered to the listening experience, you'd be unable to judge whether the aforementioned CD-R sounds good or not. The truth is that I know you WOULD be able to judge it, because I know that if you heard a song on the radio, you wouldn't have to read the Wiki on the band before you thought to yourself "This sounds good" or "This sounds like ass."
Now, with regard to the process/means, as I said it's very important outside of the listening experience. For instance, I have a lot of respect for musicians who conceive music largely for a certain instrument and then obtain a degree of technical proficiency which allows them to fluidly realize that music. Hell, John Petrucci influenced me to practice guitar 6 hrs/day and I kept it up for about 6 months. I also like hearing about certain methods of composition (such as the Opeth example above), as they could be useful to me as someone who writes music. It's always great when musicians find processes that result in themselves or their band making great music.
Your situation is the following: You genuinely like Opeth, Miles Davis, etc. and genuinely don't like pop. The reasons why are basic issues of taste (ex. simply prefer Miles Davis's trumpet solos to Justin Timberlake's vocal harmonies). You also have an admiration for the means your favorite musicians have developed for realizing their own particular style of music (technical skill on an acoustically-based instrument, improvisation technique, etc.). Now, your error is in relating the pleasure of the listening experience to your admiration for your favorite musicians' means. Thus, in equating pleasure with admiration for means you assume that since you don't get any pleasure out of pop music, the means that its musicians use to create their music must be inherently flawed (which is why you're shitting all over every convention in the creation of pop music). I've already shown with the hypothetical example above how ultimately irrelevant the means are to the end. As I said, in actuality your qualms with pop music are simple issues of taste (ex. you don't like how mechanical and rigid it sounds). I bet if you found Justin Timberlake's music catchy you'd be much more accepting of pop music recording practice.
By the way, the danger in the excessive importance you put on the means is that it limits you as a musician. Because your error results in an apprehension towards pop recording conventions, you will always be prejudiced towards them and never be willing to attempt to use them to make something you actually do like.
With regard to my own music, I have a pretty decent voice. It's slightly on the "rock" side but pretty sing-songy (I think I sound a lot like Josh Homme of Queens of the Stone Age). A lot of what I write and what I'm inspired to write is instrumental, often completely electronic. Being a big fan of a lot of pop music and extreme musical clarity a la Mozart (and Rihanna for that matter), it influences my music. I imagine that if my voice sounded like Justin Timberlake's and I recorded a very electronic, poppy song, you'd hate it because it was written by a big group of uninspired songwriters and sung by someone who had never composed a note in his life, right?