There are a number of good ovals out there..
The new Golden Grove oval is a great surface, even in the middle of winter
Salisbury Oval was always good, because of the open spaces and the supporters always gave a hard time to everyone
As for Bad ones
Tea Tree Gully was terrible after June time.... BUT
Modbury was the worst ground because not only was there no grass before the rain.. but after the rain it smelt like cat piss....
Then there was the day they played a game at foxfield Athelstone, where a bloke from Full Back kicked it in from a point down the hill (and down wind) and a mark was taken about 15m out from goal....
Salisbury oval is a good one, played many a wet final there. As for Tea Tree Gully being one of the worst, a few years back you were lucky to see grass in winter, but since a number of drainage upgrades, it has been pretty goo for the last couple of seasons. The turf wicket will always be a little boggy.