I've only completed like one SMT game (Devil Survivor), rest I put like a ton of hours then end up dropping for some new fighter or something so I don't really have one I can say I truly dislike. Sucks you dislike P1 though. I love the
battle theme and
boss theme.
My first SMT game is Devil Survivor 1 and for the past few years after it's release I've been trying to play SMT catchup.
EDIT: Aw crap, I put all this effort into leveling up Chie and getting her decent shoes and raising her SL
and someone told me she is the worst party member in the game. Wow....waste of some hours.