With WoW, I rarely have to stay in one area for more than an hour. That's why the "grind" is less evident. Advancement is very quick. I've played EQ2 as well, and I agree that it's a better product if you like a more difficult climb. EQ2 also has an incredible amount of item variety, quests, factions, housing, etc. There were only a few areas to explore pre-level 20, and that bored me. Once I hit 20 and explored the new zone, I quit because I knew I had a tough climb to get past it. Still, I might go back if I ever manage to hit the cap in WoW and get bored there. I'm super slow at levelling in any game, no matter how easy it is. I just hit 50 in WoW and I've played the easiest class since retail began. It takes me close to 20 hours to gain each level, and I only play 5 hours a week.
RF Online is very artistic, but it seems to be missing the best parts of WoW and EQ2. It doesn't have housing. Honestly I haven't seen the PvP, so I can't comment. That might be the best aspect, and again, it was something people loved in Lineage 2 as well. I still think that's the closest comparison.