I'm a little surprised that this never caught a review!
This card is -somewhat- nasty. -1 to all skills definitely sucks no matter who you are. But despite how evenly applied this looks, it definitely hits some investigators harder than others.
Investigators that don't mind this: -Investigators that are hyper focused on boosting and using one stat can potentially ignore this, at least until it's convenient to deal with. -Investigators that can reliably get extra actions have more room to clear it and not lose most of their turn. -Investigators that can do things without tests.
Investigators that do -not- like this.: -Investigators that rely on multiple stats (especially if they have add X stat to your stat for this test cards) get it way worse. They can't reliably stack their stats high enough to negate the haunted -1. -Investigators that don't have good action compression or extra actions will (as with any double action weakness) have less of a good time with this as well.
It's not the worst weakness in the world, but it's sure messing me up sometimes. And ultimately, a -1 to all stats will affect almost any investigator, unlike some of the more recent basic weaknesses that might as well barely be a weakness if you're the right investigator.