The Court House Hotel in Newtown has a good lineup last time i was there they had ACDC BIBLE , XMEN LE, Monsterbash, Indiana Jones (williams), Fish Tales, Transformers and Tales of the Aribian nights. All machines worked well and they normaly have a tech guy on site if you incounter any problems.
Not for from the court house right near Newtown Station is the Town Hall Hotel . Normaly have 3 pins on site.
Here is a site for some other locations around the city
http://zball.com.au/index.php/locations/
A few of the other pubs around Newtown have Pins but i cant confirm %100 what ones.
If you venture out west there is a small arcade in Cabramatta have around 8 pins but not in the best of shape.
If you decide to go up Newcastle way drop in to Pizza and Pinball.
https://www.facebook.com/#!/pages/Pizza-N-Pinball/335698366444935?fref=ts
Good Luck and Enjoy Sydney.