Great!
Based on those filters, it appears they either were never cleaned, or were cleaned and filtered too good. If the filter is charcoal, then I imagine you could get a "refill" or get one custom made.
When we first moved in to our current house, we had to soak the three filters on our smaller RobinHood (3 speed, Burned out lights) for 12 hours in an Ammonia bath and then do some serious scrubbing. Subsequent washes after serious usage (some months later) seemed to help - so maybe you want to run so cooking steam through it too, clean the motor and give it some oil
I can testify to modern hoods being hugely inferior to models just a decade or less older. The old RobinHood in our house moved MORE air (with less noise) on Low/Medium and was Gale-Force on high (just as loud) - even with dirty filters. The new Westinghouse, which blows in your face (not into the ceiling), is loud: no-matter what the speed and couldn't move air to save its life. There is NO suction from the "filter" (more like a fly-screen mesh) even on high, whereas old Robin could do that on low. This new one even has TWO separate fans. Fat load of good that does...
But for all intents and purposes, that hood likes like a winner. Certainly not feature laden (You could get Electronic Touch RobinHood 2000's back in the 1980s), but I'll bet that thing does it job and quite well to boot.
The link below shows a RobinHood 3000, ours was something like a 1000, IIRC, but this one is fairly similar
http://www.gumtree.com.au/s-ad/greenwood/cooktops-rangehoods/robinhood-3000-rangehood/1016803015
