First 4 stages felt more or less the same as the Crom fight, even cleared it the same way as I did the previous (skills on stage 1, full burst stage 2, skills on stage 3, full burst stage 4). I'm sure some mobs have different overdrive attacks but it make little difference it seems.
Found Jorm a bit easier than Crom as you can skip the special activation skill entirely, which seems to be activated as the first overdrive when she has 50% HP or less.
Hopefully the lack of potion drops don't become too much of a problem. Having guaranteed ones was nice for Crom.
edit: Seems like they might fix it. Maintenance to fix drop rates for GO and the only two things that drop are gems and potions.