I think a lot of them were out of order. (when you actually found one)
Grain of salt and all that, but a disgruntled Service Ontario rep told me there was a dispute between the equipment vendor and the government over the service contract, so they took forever to fix. Also, the final nail in the coffin was the kiosks were easily hackable (like an ATM) and the vendor wanted even more $$$ to secure them properly. Again, not sure if true, but it sounds plausible, given the known problems with similar initiatives like e-Health. A bit annoying too, since I never had an issue with my local kiosks--they were the logical step forward to ending the dreaded lineup. I think the longest I waited was 10 minutes; most of the time, the thing was open for use.