My biggest grievance thus far is about spell slots. Wizard, Cleric, Paladin, etc, it just feels underwhelming to have so few casts before being locked out of certain spells. Cast a level VI spell once and then have to rest? I like the whole "back to camp to rest" mechanic (mostly), but just to recharge spell slots? Ugh. I spend a lot of time using cantrips just to keep from using those oh-so-precious spell slots.