Staffing at Hogwarts/subjects

[sbursztynski]

No: HPFGUIDX 78642

Please forgive me if this has been discussed, but I did check the 
search facility...

Are there any qualified teachers at Hogwarts? There are certainly
some 
who are good at it - Flitwick, McGonagall, Sprout ... probably even 
Snape if he would stop picking on certain students - good teachers 
don't do that. But it seems to me that to get a teaching job at 
Hogwarts you don't need to have attended any wizards' teachers' 
college, you don't even have to have finished school. You just have
to 
have some knowledge of the subject (unless you're Umbridge) and be
the 
convenient one to hire at the time. Sybill Trelawney was allowed to 
mess up Divination for 16 years' worth of students just because of a 
prophecy lurking in her head, with the possibility of another one -
so, DD couldn't just offer her a home, maybe make her library 
assistant (goodness knows, poor, hard-working Madam Pince could do 
with help, but that's a separate gripe from this school librarian)?
DD 
has handed the very important job of DADA teacher to another 
disastrous person each year (except Lupin, but that also ended badly).
And does anyone in the wizarding world ever get to study literature, 
history or music? There just doesn't seem to be room in the Hogwarts 
curriculum. Sue B