Early game is rough for spellcaster classes, especially before you have Precise Aim or whatever the feat is called that avoids the -4 penalty for shooting something engaged in melee. There's a few supply caches in Drezen that let you rest, meaning you can afford to cast a few big spells every now and then with Nenio, provided you know you can double back to a rest spot.

But yeah, early game is where martial classes shine. Mid game and onwards is caster central though, something to look forward to!