Codebreaker seems like a useful card when matched up with the Tesla Coil. You get the wall-hack for the rest of the game combined with the alt fire to shoot through the wall for a limited amount of time. What I see wrong with Codebreaker so far is that when you collect all of the code fragments the animation to combine them takes a little too long. It makes it almost impossible to see anything that’s directly in front of you.
This could almost be seen as a balancing effect of acquiring all three pieces, but really it’s not THAT bad that it could be written off as such. I agree: the animation should be changed, either by putting it up in a corner out of the way, or made transparent, or sped up a lot, or a combination of these.