>>23274153>RBDozens of metaphorical and literal game-breaking buggs, dozens of blatantly imbalanced and/or badly designed mechanics
>GSPathetic level curve, cool but very shallow (and again, very easy) post-game, introduced Baby Pokémon, introduced Roaming Pokémon, no Safari Zone, many Johto Pokémon are unreasonably rare (even post-game exclusive) and significantly weaker than Kanto Pokémon
>RSStarted the trend of heavy story and Legendary Pokémon focus, the plot ranges from nonsensical to ridiculous despite this focus, Aqua/Magma has even less Pokémon variety than Team Rocket, your "rivals" are weak flat characters, late game is Surf: The Experience, fishing is needlessly complicated in a heavily tropical/Water focused region, rare berries are extremely rare and require unreasonable time investment to properly grow, extreme reliance on HMs to roadblock, lack of Day/Night cycle introduced in GS, and despite introducing 135 new Pokémon over 180 older Pokémon were completely unobtainable for two years until FR/LG was released.
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