The game has my least favorite War Battle system in the series, but I love the skill system and how it does really change combat if you give it any attention. Also don't be fooled by the teachers, their ranking of a characters aptitude for a skill actually regards how much the skill will cost to advance a rank, not how good they are with a skill. While most characters will rank low with a skill they have poor aptitude with, some actually can get up to S Rank, it just costs a ton of SP to max it out. Thomas and Piccolo are probably the game's two biggest offenders of this.