The monsters hit me way too hard. Having to 'pray' after every battle is not fun, it's slow and frustrating. I know I should be using a Mercenary and at first, I liked the Mercenary system, but when I discovered I couldn't determine what skills the Merc used, it just became another source of frustration.
My Healer Merc burns through all her mana casting damage spells, when all I want her to do is cast healing spells and help out with a few normal attacks. So I end up with just as much downtime using a merc as I do without one.
The first few levels of the game were fun, but from about level 12 the monster difficulty ramped up and the fun factor really went down
