I have fond memories of Red/Blue, but for me Gold/Silver annihilated them. I felt a genuine sense of atmosphere when I played, especially after 6pm when the game was in night mode. Beating Red/Blue (the final boss in G/S, that is) felt like a real achievement after a 16 gym slog, with his lvl 80+ pokémon.
Subsequent games smell of wee. They're probably still above average games, but they don't compare.
red and blue were well good
i have every single game apart from yellow and diamond and they merge into one, after a while.
one of my favourites was the one where your dad was a gym leader and there was a forest town!