I understand the game is supposed to be challenging, but if you tell me to defeat 5 of something that means 5... NOT 10 or more! I'm really getting frustrated doing fights over and over again with no results. The game is starting to become tedious and not really fun.
I understand your frustration, but keep in mind there's a difference between "defeat five" and "defeat and collect five." You're probably having problems collecting things...
Especially for higher level worlds, the drop rate for items we have to collect is often set to 'aggravating.' Sometimes logging off for a while to do other things can help when the mobs you need to gather stuff from aren't cooperating and you're ready to rage quit. Basically, it gives you a rest and your patience time to recharge.
Azteca and Khrysalis are both long and tedious worlds. The good news is, Polaris and Mirage are paced a lot faster.