That’s probably something a person who has no clue about Pokemon could say. You underestimate how many mechanics older games contain, since like half of them are not obvious for casual players. Although I am not sure about gens newer than IV (Diamond and Pearl is the most recent I’ve played), since I haven’t played them. But most people agree that the best games were around that period (Gen IV, or V), and they only become worse over the years.
Finished first Quake recently (EXCELLENT game, still very much playable even after nearly 3 decades, definitely 9/10), and currently playing Perdition’s Gate, it is kinda unofficial Doom 2 expansion released in 1996, and it had chance to be included in Final Doom (which are two additional official episodes for Doom 2), but ultimately it was decided against it.
Perdition’s Gate is kinda interesting as it has some unique elements and I genuinely enjoyed it even though there are probably much better Mega WADs nowadays, later maps are too short though, and it looks like they have made them only to accomplish 32 maps total like in the original game. Secret maps are also… odd… definitely not bad, but… just odd (and disappointing to some extent I guess), although I am not going to spoil them for you. Also the locations for secrets are also weird.
Interesting and odd is I think the best description for this Expansion/WAD.