I think one thing nugenners usually fail to grasp is that the whole love for the 151 goes much beyond the designs simply being better, it's about having a self contained world you genuinely enjoy as is. When people say they only care for gen 1 it doesn't mean they enjoy poorly implemented archaic gameplay mechanics, it's more that when you're in the world of Red and Blue there are no pokegods, ridiculous plotlines, etc. When you look at the pokémon universe as it currently is sure there's maybe a whole lot more that you can possibly pick and choose to enjoy but it also means having to ignore or accept so much crap that is just horrendous.

Know what I mean? Perhaps someone with a better vocabulary could explain it better.