Originally (up till Diamond+Peals release) I only owned the Golden Age games (namely Red and Silver for me). However once D+P came out I got curious, and despite having little to no relation with any monsters past 151, I picked up one of each generation. I now also have Ruby and Diamond, and will be picking up SoulSilver when it comes out. Also I have FireRed and my shiny MewTwo I found in it, second shiny I ever got.
I realised when playing these that while many of the new monsters didn't endear themselves to me, the games themselves have gotten a LOT better. In pretty mcuh every way, though I do still sometimes pine for the simply GBC graphics and their retro charm...so I whip out Silver. As it happens many of the new monsters aren't great, but some are good, a few actually. Plus, the original 151 contained monsters like Tangela, and Jynx, and Mr. Mime... random creatures I was never fond of, but tolerated anyway. Same with the new games.
What can I say? I was brought up in the 90's, and I love Pokemon. Just took a while for me to come full circle.