The entire point can be surmised in a single statement:
The point of a game is to have fun. The current design and flow of combat with all its complexities and computational attitude is decidedly NOT fun to play.
Pretty. SImple. Concept.
Haha you should have fought Lord Firkraag!
Seriously though - no the fights are not too difficult at all and finally present some intellectual challenge, which I find sorely missing from a lot of modern day RPGs (starting with DAO - which is one of my favourite games of all times but a huge backstep from BG2 in terms od combat complexity).
And I'm sure there's gonna be an easy mode later on - they've always said
EA is meant for hardcore fans and those expecting a smooth ride should wait for the full release, so what's the problem?