I found that there are a lot of pets I don't like too, but mainly because of outdated art.You've rated every pet!
I really do not like Torrey, Ruffie, Charlie, Devonti, Harvester, Hikei, Turdle, Velosotor, Lasirus, Malticorn and Kora in their current states, to name a few. I'm sure if they were revamped my opinions would change as I like the idea of them, just not how they are at the moment.
However I think I like most Endeavors, Escalades, Cadogres, Tigreans, Aeanoids and Sheetas.
Also Graveyard pets. Need I say more? Look at them the Wyllop, Velosotor, Feli, Torrey, Terracoon, Swampie and Hikei are all terrible. Those are just the ones I can remember, please say that on Halloween the pets all get revamped or something. It really looks like when it comes to revamps people forgot these guys. I know these have potential too *pokes Graveyard Tutani and Endeavor*