1.Yuffie steals the Materias. That was really annoying.
2.No Vote. Havn't played FFVIII yet.
3."Mums are tough". I was like.... ugh On the contrary, never had a single problem with the Lightning minigame. In fact there is a specific spot in the Plains to complete it easily without wasting decades.
4. No vote. Same reason for n.2. Seymour was hard to beat the first time, but as soon as you learn how to use Rikku it becomes a lot easier imo.