I have different set of preferences, but the most different opinions on placings I have about Conquest, which I would upgrade to C rank (in AI hands its merely capable, in player hands it can solo entire fleets in some situations), Paragon, which I would upgrade to A rank (the most expensive ship in the game, but very easily worth the expense, unmatched in raw power), Hammerhead, which I would upgrade to A rank as well (the most well rounded destroyer with excellent firepower, placing it ahead of its peers), and Lasher, which I would upgrade to rank B (similar to Hammerhead, but Tempest exists and blows it out the water).
On the other hand, I'd take down Shrike to D rank and Shrike (P) to C rank (it's okay for what it is, but it isn't much), Hyperion down to rank E (it's powerful, but so expensive, it can hardly ever break even), Scarab down to rank F (I tried to make it work, but it's irredeemable rubbish) and Wolf down to rank D (versatile builds are harmless, specialised builds can't compete with other frigates).
Though my criteria are different, since my first filter is burn level (no cruisers until I go cruiser-burn, no capitals until I go capital-burn) and the second is quality of a ship: it has to be either expendable or exquisite. My ships should either die without much notice, or not die at all.