Though the 0815 attribute und skill leveling system and the armor system kind of kill real creativity. In the first game you could play a rogue-airmage-tank and still be effective, in this game being a tank is useless and combining magical with physical sucks even more. In the first game, as far as I remember there surely were some imbalances, but no damage type was superior to others. Now Physical beats magic in general and fire/earth beats water/air in usefulness.
Sure, there will be always posibilities to break the game, just because of the difference between In-combat-speed and ouf-of-combat-speed work. But the numbers inflation in the endgame and the numbers bloat in tactician don't make the game more interesting or challenging, only more of a chore were you heavily depend on a fitting level and level fitting equipment if you don't want to use gamebreaking mechanics.
All that matters is damage in this game, therefore Lonewolf is the probably most broken mechanic.