Do you prefer the damage system in KH1 where enemies could only damage you once at a time, or the combos that enemies could pull of in every game after? 

In KH1 it made things too easy.

In the other games it made it annoying how there were pauses in between.

Probably the later

I suppose every game after, however if they've allowed it that you can get caught in an infinite loop of combos without been given a chance to recover or at least heal then it's unfair.  

The combos of the enemies make the game more flashy. Also it has to make you think more wether or not you should be evasive, defensive, or if you can risk offensive

I'm going to have to say the combos from every game after, simply because it seemed to add a bit more of a challenge. 

C-c-c-c-c-c-combo BREAKER

I like the comboing enemies better. Makes things more interesting

I like the comboing. I liked how in COM, if you could continually card break the enemy, you can never be attacked.

The 2nd option.