>kanto's monotony and blandness
Can be fixed through ROM hacking.
>johto's level curve and npc teams
Can be fixed through ROM hacking.
>sinnoh's slowness and pokemon distribution
Can be fixed through ROM hacking.
>unova's excessive dialogue and linearity
Can NOT be fixed through ROM hacking.

It's official. Gen 5 is objectively part of the nu-Gen games, as it is fundamentally flawed.

Some other facts people aren't ready to hear:
>hoenn is already near-flawless, and doesn't require modifications to "fix"
>the johto games become the best in the series after minor fixes
>everything after hgss is worthless