This is a good point: Bioware's idea of super-powerful bad guys is, all too often, immunity to almost everything, which makes them much tougher for characters that focus on the Force / magic / whatever the scenario's supernatural power is :D than for combat characters. In my experience the Black Isle games didn't tend to suffer from this quite so much (the only BIS pan-immune end boss I can think of is Behlifet, Bioware's all are) so hopefully Obsidian won't make this mistake.
Malak was a dark Guardian, wasn't he? So he should have been less immune to things and better in melee combat, so that the Consular tactics had to be stand-back-and-smite, and the Guardian tactics required attention paid to the screen
Yes I agree what the point of becoming a super strong consular when u cant use any of ur powers against the main boss, it makes it a great waste of time! What i do when i play a consular is to buy/collect any items that improve ur strength, which improve ur sabre skills so that u can defeat Malak more easily!