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I don't like the way OP goes about it.
To me, gen 2, is like the Burning Crusade of the Pokémon franchise, it introduced many, many features, some of which were pretty ahead of their time on the GB/GBC.
To me, it was a perfect "All you liked about the previous game... enhanced!" without the dumb down games sequels go through these days.
Many gen2 fans have legit reasons other then "muh nostalgia" to be so passionate about that game whenever it comes up.
Gen 2 added, build and improved on its prequel, it evolved from it in a familiar way, part of this could be attributed to the fact that it was direct sequel, a part 2, a "more of what you liked, but better!", it just felt right.