DarrkPhoenix: The fight against the crab monster is probably the toughest fight in the whole game (and the only one I had to try multiple times).
Porkdish: I realise its a difficult area and optional etc, and that you can and probably should leave it till after the main plot. But its areas like these that make you take a hard look at the game's battle system.
I went there too early, sure. But no matter how much more I levelled, it would still be hard for my fighters to draw aggro and protect weaker party members. No matter how buff my mages got, they where still never going to get area effect/crowd control magic. No matter how much I levelled there was still no tactics to avoid the clumsy manner enemies can swarm wherever the hell they like.
You
can beat the game without being at all bothered by the battle system because the major plot line has options to avoid encounters and most of the forced battles are so easy enough to pull through. I just happened to try that temple too early and found myself frustrated by the game's definition of difficult. It isn't one you can really beat with clever tactics or abilities, just more hit points and better equipment.
I find it best to take direct control of your spell casting characters that have attribute altering magic and let your tanks go AI to hack away mindlessly.
In some of the closer call battles that I've had, I had to pause every time cast spell would verify by it's icon appearing next to the avatar I cast it on so that I could hurry up and cast the next one without too much free time between pauses.
What frustrates me is the speed of casting and I'm hoping that is because I'm still towards the beginning of the game (just defeated the golem in the warehouses) and my character's levels are under par.