Yeah, you can beat the whole thing in a few turns. The enemies in the courtyard and ascent to final boss were a bit better, but still akin to any number of fights in DOS2 (vs. a climax).
Yeah, just to add on, Orin and Gortash were much more interesting fights for me even; Ketheric took a few iterations to realize what the pattern was. But the final battle is either Sisyphean or cheesed entirely. I haven't played either DOS games, I might take a go at em.