I really liked the new field effects, but I never did the math behind them, nice to get a grasp on how much they affect stuff.
Also, I'm having a really hard time adapting to the use of stat altering moves, since I never used them in any of the original games and I still fail to see their effectiveness. I put reflect on my Meowstic after reading these answers, but I think it's way more underwhelming than just using psyshock and 2HKO almost everyone, but I'll learn sometime hahaha