Yeah if you install the FSport and make a mission with no shields, ml16s, and whatever the heatseeking missile was for the FS1 campaign and then go try to attack any cruisers with fighter escorts, you'll respect them a little more.
Anyway, I think the old posts were overthinking things. Even though the taranis was given the destroyer icon etc, all you need is a cruiser as a command ship and some support fighters and some freighters to make a little scout force to look for nodes to interesting systems with planets to bombard.
So you have the taranis scouting around what the shivans consider an uninteresting area with low threat potential, and then the GTA bounces it, blows its escorts away, and tows the thing off. Shivan high (?hive?) command gets irate and sends the lucy over to show those pesky humans what it thinks of attempted theft.
Anyway, this would make an awesome mini-campaign to track it, bait it out, steal it, escort it to the station, and then be part of the evac escort when lucy shows up.