The Scow can be helpful if you have room in a war fleet for it. Shoot, you get the 250 credits even if participates in an anomaly fight.
There are a few that flip planets and combined with range extenders, they are very powerful.
Other than that, there are a few that stack defenses on the whole fleet, and those are particularly useful at the right times.
Remember that you pay no maintenance on these ships, so the fighting ones save you credits you'd otherwise pay in maintenance costs.
