Funny, as I went ravager with Sarah and Commando with Noel.
I've also found the game incredibly easy, but I think that I've done too many side quests (I've just done Mog's quests in Oerba and Noel is 99 Commando and 99 Sentinel, Sarah 99 Ravager, 99 Syn and 34 Commando now). The only 'hard' thing I've seen is those damn clock puzzles!
I think the pets are very clever concept, especially how you can level up one just to have it as infusion fuel for another pet.