Well I use to play Fiesta on and off, and I had gotten to lvl 17 and was able to begin the new kingdom quest, but to my dismay nobody wanted a lvl 17 archer in their party. Other than attempting to join in KQ parties, the grind I found was extremely slow, is KQ the only real way to level?
Current games : LaTale lv 26 Wizard (Fira)
Personally, I HATE grinding. I'll quest or do dungeons even if it isn't the most efficient way to level, just because it's more varied and fun for me than grinding the same monsters for an hour. I really only see "grinding" as just repeatedly killing the same monsters in the same spot for long periods of time.
From my perspective, I can't really understand why someone would opt to grind rather than do quests or KQs. Sure, you're leveling more quickly, but you're just headed towards more grinding. What's the point?
Compared to other free-to-play titles like Flyff, for example, the "grind" in Fiesta really isn't that bad. And there are tons of quests, dungeons, and KQs, so that if you don't want to grind, you really don't have to, especially early on.
Like everyone else said, the new update provided GREAT xp rewards too help you level. KQ's are just a fun and easy way too gain xp, but basically they're there for opional reasons. Once you get more into the game, make friends, level more...you'll get more into it, I promise.