This is for the Classic Loki server. I have not played on the Renewal server.
In terms of a decade old MMORPG, Ragnarok really hits home for the nostalgia factor. Gameplay is still smooth and fun. I quite enjoy playing.
The botting is rampant, don't bother trying to sell anything through vending. Someone has more on sale for less because bots.
War of Emperium is a cycle of 3-4 guilds exchanging castles on a weekly basis. If you want to try and bring a new guild in, be prepared to be squashed by maxed out veterans wearing god-items.
The market is beyond skewed. The botters have so much on the market that you are LUCKY if you keep a vigilant eye on sites like ragial.com
for good deals, as some poor sap tries to undercut the botters of their excessive amounts of loot.
To counter the botters, folks will often crack "dead branches" (spawns high-level mobs) where bots frequent in an attempt to grief kill them. Chances are you will die a few dozen times to these things walking from Prontera to Izlude or just trying to get to your hunting grounds.
Logging on, the server is usually at 500+ players. Of that, I suspect 150-200 are vending and about 100 are actual human players. The rest are botting.
With the population so low, it does make the game a bit more fun, in terms of not having to fight over mob spawns (unless it is a profitable area with decent returns, in which case you'll be fighting with botters for mobs) and Prontera is, pretty much, the only place one will find Vendors. There are some in Payon, sometimes. Ragial.com's
bot only survery's Prontera/Payon, so why vend elsewhere?
There are constant "jump" events. Events where people can take their character from lvl 1 to 70 in a day with a few simple quests.
Falling outside of the 15 level limit for shared exp in parties will leave you lonely and bored as the rest of your guild refuses to help you catch up because there is no profit for them in it, despite having helped them along...
TL;DR, plan to play a solo game and you'll have fun. If you played this back in the day, Classic Loki is, pretty much, exactly the same game you played 10 years ago.
Despite all the annoying and frustrating things I listed above, I still like the game. I just wish there were fewer botters. :(