Based on the quality of some instructors I've seen, I would say:
"No where near hard enough!"
IMHO, no matter what the agency requirements may be, 100 dives is not enough for someone to even be considering instructing.
I also think that someone should have to serve as a DM for a while before being allowed to take an instructor course.
That is like someone who just got their license wanting to teach a driver education course...
No offense to the poster of the question, and not trying to quell your enthusiasm, but if you truly want to be an instructor, wouldnt you want to be the best instructor you could?
The best way to do that is get out and get some diving experience before trying to teach others how to dive.
Just wanted to say that I totally agree with your assessment; even though it was made 6 years ago.