Spies do randomly disappear, it's true. Most of the spy operations have very limited, if any, value except collab govts which are super strong.
The coordinated strike feature, which is supposed to serve as Japan's surprise attack on Pearl Harbour, is completely broken (AFAIK, since release) and does nothing.
Armoured Cars have been a waste of time and dead end technology since they came out, and to this day are still objectively worse at their primary role of garrison template than interwar light tanks are.
Code breaking is useful but a rather boring implementation, just a button click with no thought behind it.
On the plus side the focus trees are good. France, Portugal and Spain I think it was? All interesting trees.
So buy it on sale for the countries. The rest is mediocre to nonfunctional.