Virus bombs are only useful if you have to give up a weapon arc, and you get lucky and roll "Turret", because you give up nothing.
You are in for a nasty surprise, though, if you run afoul of the Targrath. Check out this ship carefully, it's a nightmare that you'll have to repeatedly face. You MUST evade its CAF area, and kill these as soon as possible.
The current nasty unlikely surprise is the Mass Driver. Not all ships mount one, but whenever you All Stop, make sure you still move forward 1/4" or so every turn. These things are the nasty surprise. You get speed zero near a Mass Driver, the ship will likely die next turn in exchange for no firepower.
Trick: Remember, maneouver to shield with a mobile ship can temporarily save a life. When a Mass-Driver armed ship lines up a shot on something Speed Zero, make a mobile ship maneouver to shield. Then, if you suceed, the Mass Driver would have to fire at the Shielding ship --- which will almost certainly miss!