I don't really have too much trouble -- I find midgame is where farming +Eggs, evo/food mats, and planning teams accordingly is where the meat is in the game.
On the contrary, I found the starting a little boring. It feels really straight-forward until you hit Castle of Satan where there's a sudden wall of difficulty. It just feels like they didn't stress importance on team-forming slowly on you and suddenly when you hit CoS, you're stuck until you grab stones and roll during galas.
Cleared my first descended today and got Hera on my first try. I thought it would be harder honestly but Odin tanks everythiiiiiiing.