Isaac is an engineer, so the idea of hacking mini-games isn't as off-key as you make it out to be. All in all I don't dislike these mini-games. Tracer can be frustrating at times, but it isn't "garbage". The Virus mini-game is awesome because it's just fun to watch your viruses wreak havoc, kind of in the same vein as sending a massive force againt the zerg in Starcraft, and the other hacking one is very thought-provoking.
All in all I'd say it's a decent addition and any true Dead Space fan won't completely shy away from it. There are far better Arcade games out there, but this one, at least in my opinion, is far from the worst.