Actually I don't think both Arcaum and Fo1's combat is good. both are sucks. for Fo1, with tubo plasma rifle you can kill all the enemy easily. with power armor, there too little enemy that can harm you. too small choice of weapon, little variety of enemy etc.For Arcanum, there's are more method to use and far more feature applied. it just lookig bad because it has far more complicated system compare with Fallout which has far more simple and easy to under stand.
Please confess that you didn't not played Arcanum.
Arcanum is complicated? That's why all fans of Arcanum laughs from, for example, one funny fact, that you can complete game and kill anyone using first damage spell - harm?
Really, play it, then judge.
Combat system of Arcanum is easier that any Fallout, because it's pretty like Oblivion - hit, hit, hit, hit (if using magic, mana pot, if not hit again)
While easier and bigger, more unbalanced thought.
so what I want to say isn't about Arcanum's combat is good. actually balance is bad but either Fo1. but for Arcanum there's alternative of magic. but for Fo1, there's too little alternative of power armor and energy weapon. and For Fo2, variety of weapon, useful companion, variety of enemy etc so far better than those two.