Eh, I kinda think those were the only things that made it challenging.
Even with that most encounters that weren't FOEs are just kinda... there. FOEs were fun but other than a select few most can be figured out first time if you know what to do. Plus panic. Oh panic.
I honestly can't think of a non-turn-based-tactics RPG where I really, honestly enjoyed the battle system and didn't just do my best to break the damn thing in half as fast as possible.