Why is Vader's ship so bad? and falcon, for that matter.

"Georgemi6;c-1462307" wrote:
Run Biggs with Vader. As long as you keep inflicting target lock, Biggs will be unstoppable, and Vader will be safe.

Biggs is unstoppable and Vader is safe until you get to the higher end / older shard of fleet arena. At that point everyone's ships are able to overwhelm Biggs' protection gain.

It's still a strong combo, which is why nearly everyone runs it, but Biggs doesn't last as long anymore.