Controls take some getting used to in the originals, but once you understand the principle, it's not all that bad. Thing is, the entire game is made of blocks, and when you recognize that you know which jumps you can make and which not, and they're all the types of jumps you learn in the tutorial.
AoD was in that kind of in-between period where they didn't quite know how to evolve the controls. They're just odd, neither classic nor modern feeling. Hard to describe. And yeah, not running by default made the game feel a lot more sluggish, which was not helped by the fact that they tried to add RPG-lite mechanics to make the game more realistic, which limited your athletic abilities quite a bit, especially in the beginning.