The design philosophy for PACK has been to create a set of fleet members who, when combined, outweigh the value of the individual players - i.e. the sum is greater than the whole of it's parts.
I think it works, to an extent, and generally mixed fleets are more effective than simpler fleets.
Take for example:
In this fleet, we decided to take a couple of Schnauzer-class frigates. These operate similar to 'Safety Override' ships (without the CR downsides) and consequently have high mobility and high flux handling. They are, however, paper thin - but the base level of mobility and flux efficiency gives them some level of survivability. Depending on fit-out - they can bring some high-alpha or some generalist support with her all-round energy mounts.
Supplement them with a Pitbull - which has high alpha-damage potential from four small missile mounts, decent resilience from high armour, good pinning potential from the kinetic barrage of her built-in Ripsaw - and the fleet becomes much stronger. The Schnauzer and the Pitbull are somewhat reliant on each other - as the Pitbull can't get close to anything that isn't harassed / distracted - and the Schnauzer can't stand toe-to-toe against many things without high levels of personal danger.
This fleet also has a BRT (an Escort Destroyer with good point defense capabilities), which can be a good defensive choice - to give respite to the Pitbull and hopefully field against smaller / more mobile threats.
The Labrador is included to handle some logistics for the fleet, but also has a FELIX drone to provide on-field interference; minor support; and can operate fairly safely in a retreat condition with her burn drive.
Also note that each one of these craft will perform poorly on their own, and it can be difficult to field a very small PACK fleet that maintains a decent level of combat effectiveness.
OR if we are feeling like we should go all customized:
We are immediately stronger due to the PACK Custom-shops having wide-ranging nett positive benefits (so comparable base ship vs. any of the Canebianco / Caomarelo / Rothund will always be worse; in differing amounts and against different comparable strengths).
The Bedlington (CB), a high-tech modified version of the standard, has a much improved shield (although now locked to front, it covers about 300°). This also has an Ion-drone following it around (as a built-in wing), basically a free ion cannon. It's a great disruptive force - and can be built around the front-locked medium energy for support or alpha-strike hit and run. It's super-quick, and with an efficient shield it can survive some abuse. It's even lighter than the Schnauzer, and will almost entirely buckle under the weight of just a single stray Harpoon MRM.
So we've taken a Komondor (RH), a heavily armoured version of the standard Komondor. The Komondor has lots of forward facing universal mounts, and an Accelerated Ammo Feeder, which forces some real decisions to be made in how it is kitted out - but it can be a pretty decent generalist combatant and can use the distraction of the Bedlington to close in on individual ships to finish them off with perhaps high-alpha missiles or a collection of front facing ballistics pushing out ordnance on overdrive.
The Ridgeback-X (RH) and the Caomarelo Samoyed are included primarily as logistic support, but (as per the Labrador) there is a pair of FELIX drones on board the Ridgeback to provide interference; and a decent enough weapons package to contribute generally - perhaps safer operating in a close support role. The Samoyed is quick enough to avoid a lot of trouble (including an on-board burn drive), but a missile-centric loadout skews this particular model in to a more specialist combat role, and may not be deployed most of the time.
Again, particularly with the 'Logistics' ships - these will struggle on their own - but work okay as a team.