Yes, unfortunately.
RO is one of the greatest MMOs ever made, and a good chunk of the playerbase of ToS played it.
Unfortunately it's very old and shows it. It had a lot of shit that could use cleaning up, especially in the UI department. Some gear needs addressing, pots need a fucking cooldown or to be HoT instead of instant, etc.
There is also nowhere good for it. Pservers are a dime a dozen and filled with corruption and drama- and those that aren't go under within a year, generally. And the official servers have Renewal, a complete revamp of the game that shat all over everything.
As for why it was so good…
One of my favorites starts with you delivering ingredients for a bartender to a schoolgirl so she can make cookies for her home-ec and grandpa. Next thing you know you're fighting off a robot apocalypse- and it made sense.
Additionally, all quests were unmarked.
You can grind anywhere you want at any point in the game, and the grind route is nonlinear and dependant on your class. Acolytes would oft go from Payon Dungeon to Glast Heim heal bombing the undead. A common mage route would take on immobile fire-weak enemies they could outrange outside of Einbroch until their firewall was fast enough to stop a mantis, then they could either go after Lesavkas/Wood Goblins in Moskovia or Mi Gaos in Louyang.
You needed:
Str for pots
Vit to not die
Agi for animation delay
Dex for cast speed
Int for mana and damage
That last one is key, as my biggest complaint about wizards in ToS is mana. It isn't as bad now as icbt2 was, but it's still pretty fucking bad.
Maps were very clearly designed first, and then had stuff added for players to do. Results in a much more immersive, much less themeparky experience. ToS has improved with Orsha, as a lot of its maps have much more RO-like designs to them, but mobs are sadly likely always going to be localized spawns with max leash ranges.
The ecology of RO was actually diverse. For example, Porings (the mascot low-level mob) and there derivatives were fucking everywhere in fields, to where even lv40-60 areas would have a few poporings (lv20ish mob). Most maps would also often have a couple of spawns of really powerful enemies as well, which someone grinding needed to avoid. And rather than being strictly territorial, they chase till you drop agro.
People will say they don't drop agro unless you drop them on the map exit, but they're wrong. A mob will follow you to its sight range, but keeps its last chase move order. So it would go 1.5x sight and reacquire if it saw you.
Cast Sensor, assist, chase vs attack, etc. Not just map wide agro or no.
The markets were all flea-style with players opening shops wherever they wanted and you having to go hunting or do research to find a good deal. It seems archaeic but it feels a lot more rewarding and immersive. ToS had something similar with buy shops in icbt2, but fear of bots seems to have crushed those, sadly. I honestly hope they bring back the buy shops eventually, they're a lot better for the economy.
Normal fire cold earth wind poison ghost undead dark light.
Every element had 4 tiers of armor, with the fourth tier usually healing from itself and getting doubled by its weaknesses. Matchups were relatively intuitive- fire was good vs earth and undead, ghost good against itself, normal bad against ghost, poison strong against low tier and bad against undead and high tier, etc.
To ToS's credit, it has a good base system (physical armor + elemental affinity). But it doesn't have tiers, which I think would benefit them.
People whine about bosses in ToS…. They're at least more active for the whole party than bosses in RO.
Fucking gospel portalsura was cancer, and you rarely ever did any non-ghost-prop boss any other way because it was too much effort and fairly boring. Doing Beelz (a ghost prop boss) for example was a fucking 5+ setup that gets boring reeeeal fast. Hell, two of the roles could be filled by afkbragi and afkservice if they had petrify immune (iirc silence doesn't cancel a song only blocks recast).
side note, I kinda wanna try a linker dps instead of a sinx dps in a bee run… she'd probably be just as functional since she can ghost prop her esma, but a lot more resiliant thanks to kaupe and kaizel. Only real issue is magic mirror on phase 2, but then, kaizel.