Many complaints I see in these forums relate to the endurance/health system, pre-buffing and spell uses per day. Obsidian had many goals when designing this RPG system, such as the reduction of rest spamming to clear dungeons. Arguably it may even be worse in this game than in BG2 with the way health and healing works, particularly with teleporting shadows one-hitting weaker characters at the start of the game.
My question is this: why wasn't the game designed around a system that forbids resting in hostile locations such as dungeons? It took my characters around 3 days to invade Readrics Hold. Resting uninterrupted for 8 hours each time during a castle assault seems rather silly to me. In fact, with enough camping supplies you can spend weeks invading the castle. I also don't feel like I rest any more or less than I did during BG1 & BG2.
After 15 hours playing this game my only real gripe is that Obsidian's solutions to these age-old cRPG problems seem to be over-engineered and arguably ineffective.