Guildleves? They supposed to take the place of quests?

Other than the 1 or 2 quests you find roaming around a city are guildleves the only quests we have? if this is the case I dont think there should be a limit, and if there is no limit there should a decrease of reward on the leves just for the fact we more to do. for example in 36 hours its take for the leves to reset you can finish up to 150+ quests... assuming you dont sleep, eat, drink, work... whatever.

I can finish the 16 guildleves in under 3 hours, which is too fast, after which what is there left to do in the world? main storyline quest? nope they require certain rank levels... so what do we do to raise our rank level? Only grind or wait out the alotted time remaining to reset the leves.

Point is... we need more quests