I've never played on another server, so i can't directly compare. But from my experience ragnarok seems to be a pretty normal mmo-server. Primetime is like 6pm GMT - 11pm GMT, but there are quite a few american and some japanese players as well (so you never have the feeling its a ghost town no matter which time you log in)

Currently the server is crowded but not overpopulated (no login queues).
You can find tons of people forming groups for titan, garuda, cm & ak and a few pugs attempting coil - Tanks, healers & bards are in high demand as usual.

Community is really mixed - you got the casuals, the elitists, the nice guys & the douchebags. Most people speak english, with some french, german, italian or spanish FC- advertisements from time to time.

Prices are still high for alot of wares on the marketplace - at least compared to what i read about from the really big servers.

If you got more specific question - go ahead.