I would have to disagree with those people saying that status spells within Final Fantasy games are useless, I have been playing a few of them lately and find they are quite helpful.
One example is the Ochu in FF10, sending them to sleep and pounding them with spells will not wake them up as opponents only awake from slumber from a physical attack.
Another would be the use of poison against enemies that have HUGE amounts of HP (Such as the worms from Bikanel Island 45,000 health and only doing like 1,000 to 2,000 per hit whereas poison takes off 4,500)
You just need to know what the best time is to use them, not rely on them all the time.
In my opinion though, although not the worst you can get, the reflect spell can be a hinderance as any healing spells you may cast will bounce off and heal the enemy.
Again, many abilites are not bad, its just a matter of knowing how to use them.