No, there isn't.

I'd ask him how many Cup Finals we've won previously.
Hasn't filled me with hope yet, just still relying on his guarantee 'cause he's a f'ken decent bloke.

This guy has had so many chances must be frustrating being a Perth fan

Correct, Frustrating is one word they may apply.
But at a pinch, add Gloomy, Depressing, Discouraging, Bleak, Sad, Dejected, Heartbreaking, Distressing, Disappointing, Joyless, Disheartening, Dreary, Dispirited, Dismal ....

There are a number of other less formal words, but yeah, a win would be welcome.
There aren't too many teams that have a 1 win from 8 run, and that's not being filled up with draws, that's 7 losses in there.