Pokémon Ruby/Sapphire/Emerald

Remind me why again?

-half the region is monotonous surfing
-uninspired Pokémon designs
-oversaturation of the Dragon-type
-over-saturation of Legendaries (more than twice the previous games IIRC)
-huge step back in terms of content from the previous games
-boring story
-the worst rival (they get worse from here)

In a nutshell.

I think DPP did a lot of what RSE tried to do better, despite having it's own flaws.

Pokemon.

what happened

I grew up.

Spoiler

I started to see how boring all those games were, they were putting me to sleep. :/

Well yeah, same here, sort of. The fact that you can't lose or get a game over can make the games seem really easy and pointless, but there are ways to make the game more fun and interesting--like, having self-imposed rules where you have to release Pokémon if they happen to faint during battle, and only catching the first thing you see in each area.

Just to make it more challenging. That's the only way I play nowadays.