Nobby, tell us how you really feel. C'mon, take off the kid gloves.

Who is it here that says, repeatedly, that we are all experiments of one?
I think most novice runners (myself included) who set out to run a marathon are not ignoring the fact that it is a difficult objective and that setting a pack placement or goal pace is a good way to focus our training. (See note below)
I'm not kidding myself one bit. If I don't finish in under 4 hours for my first or second marathon, I'll try a third. And then a fourth. But I'll change something each time to get closer to reaching that goal. And if the change doesn't yield positive results over a reasonable period of time, I'll do something different.
I did run XC in high school. But that was nearly 20 years ago. I've remained relatively active with alpine skiing and hiking but I've never tackled a running distance greater than 5k. I never had the need nor the desire. So when the desire to run a marathon came, it had to also have goals associated it with it. 16 minute miles were not reasonable goals for me. Nor were 12 minute miles. Even 10 minute miles seemed very slow even when I started training. Slow enough to be demoralizing. So if I'm capable of running faster, I run faster. I've learned to use my heart rate as my guide. When the ticker screams, I slow down. When it's humming, I am humming along.
NOTE: I do agree that pack placement is kind of an odd goal since packs dynamics change with every race. I'd be with the clean up crew in any race involving elite runners. But in races that have high percentages of beginners, I expect to be at the front of that pack. My ex-gf ran Disney last year and finished in 4:11 and thought it sucked since she had already qualified and run Boston (her first marathon got her a BQ). But in relationship to all other female runners, she was in the top 15%. It was hot and humid that day and everyone (except that **** Brazilian

) seemed to suffer.
I'm actually grateful for all the different "formulas" out there from all the coaches. By studying everything and being able to pick and choose the things that work FOR ME, I feel I can become a better runner. After all, I'm not trying out for the Olympics, I'm trying to better myself. And that, my friend, is all that really matters. Well, that and finishing.
I think there's advantage to starting from zero. As we gain experience, I also think we place limits on ourselves. Whatever GOOD wisdom we get from others, we probably also get a lot of BAD wisdom.