This is great because it means we're closer to RSE being released!
Don't you dare deny us Battle Frontier yet again, Game Freak!!
If people think Gen 2 is dated... Gen 3 is ehhh...
Gen 3 is a rough generation since it's missing basically the entire second gen, it's right before the Special/Physical split (and it's incredibly obvious they wanted to do this since there's a ton of special type physical attackers and vice versa), there's soooo much surfing, and the GBA music is low quality, but not really retro chiptune charming that Gen I and II have.
Other than maybe the battle sprites (which sometimes have Gen 1 style off brand jankiness to them) the graphics are very washed out and the overworld is at an odd angle (FRLG fixed all the graphics issues of RS, then E brought them all back for whatever reason). Breeding is a mess until Emerald.
It's an awkward transitional generation between "Modern" Pokemon of Gen IV onward, and the "Classic" Pokemon games. It desperately wants to be more, but at the same time it's dealing with being a hard reboot of the series (the only in its history), missing huge chunks of fan favorites (no Eevee? no Scyther? no Gengar? Gen II representation is Girafarig and Xatu?), it's dealing with redoing the entire stat system, abilities and double battles. No run button until FRLG, so getting around is painful. Breeding is gross, no Ditto, no way to control inheritance, it's 100% RNG. Got a male one-off? Whelp. Also hope you like lots of resetting on Pokemon Coliseum for females! Obviously FRLG fixed this issue, but for a few years it was really bad...
It adds a lot to the series, but at the same time feels like a step back in places (weak roster of classic Pokemon, no day/night system, Emerald's animated sprites are lazy compared to Crystal)
Emerald helps a bit, though. It adds more Gen I and II Pokemon (Ditto, Smeargle, Sudowoodo). It helps make breeding not a disaster by adding some inheritance. It made good TMs like Earthquake able to be re-acquired if used. Also by that point FRLG and the GCN games had been out awhile, so Gen I and II Pokemon weren't that rare anymore.
But I find Gen III very hard to go back to, and this is coming from someone who has Ruby as his most played Pokemon game, ever. It's not quite modern, but it doesn't quite have the classic GB Pokemon charm.
Versus Platinum or HGSS which are one infinite TM cheat code away from being not at all dated. DP's slow battles can't be helped, but there's no need since Platinum exists. The art style of Gen IV is still my favorite in the series.