The biggest "I win" scenario is on minor enemies you can cast any summon and it will most likely kill all enemies. It you take this route you will lose MP fast but again there is always basic attack. In the end once you have Slash-All and Clouds ultimate weapon, his attack will kill everything (except boses) in one or two moves. There is only two basic monsters I know that take a long time to kill, Tonberry, and Thats red dragon creature that you can get carob nuts from. With Sneak attack, you can cast KOTR before entering a command which will kill all the bosses up until Safer Sephiroth. Sure there are the weapons, but they are optional. The game is made to be easy and the simple things about it are what make it a gem. The music, the story and they exploring all fit in where simple battles lose interest.