Ah, yeah, I completely forgot about that... I honestly don't know how decking and the matrix should work in motion, taken that my only hands-on experience with a Shadowrun session was watching my cousin and his friends play when I was a kid, and they had a house-rule for abstracting the entire hacking thing down to a single skill-check (as I have learned later, hacking in Shadowrun is pretty much a several hour long session within the session where the other characters can only sit around and watch while the decker goes on his own side-adventure), but I am pretty sure it was not supposed to look like this.
The matrix in SR is pretty much a series of arenas where you have to fight a random assortment of ICUs before you can move to the next, and you have to do the entire thing, moving and data-accessing included, in the turn based system while on the outside people will probably try to bash your head in (which also baffled me, since I thought there were different time-scales when it came to hacking and it was generally over in seconds in "real time"). Also, it was counter-intuitive to try and play as a decker in this game since you don't even get to hack into the matrix until about halfway through the main storyline, so sinking karma and money into that skillset would gimp you for the majority of the game.