We actually used to have one slider thread and it was a nightmare. I can't tell you how many PM's I got asking me for my latest.
I can't speak for others, but I do post what works best for me. There is no such thing a 'Universal Set'. Sliders are an art not a science. There is no magic formula.
I do like feedback for one primary reason. IF many people have the same bad results, it can be easier to spot a trend. You can't play a half, or a game, or even two games and evaluate sliders. WAY too many factors involved. I make 'em for the long haul for stats that will stand up over time.
I had a guy that used my MVP sliders and finally comment on them after 120 games! Now THAT is an opinoin I wanna hear. And he stated how the stats flucuated from game to game, but his season stats were great. If you get shut down in the run game in one game, it doesn't mean you will the next game or the game after.
Heck if we did nothing but post everyone's results using default sliders we'd have a wide range of results. But sometimes you can find an overrideing issue. That's what I look for. But at the end of the day I just post what's working for me. If others get good results with or without their tweaks then I'm a happy guy.
Good post.