Unfortunately, Unfortunately ... 4

is the continuation significantly worse than the first part. In filmmaking, it is how many in the whole society. If some people had a great success, they rest on and produce nothing good. Few deliver constant over years or decades from the same good job.
The action scenes are much more boring and somehow artificial. In contrast to the first part. You probably wanted to save properly, a few consultants has brought and diligently deleted.
Also, the film is partially inconclusive and sometimes illogical, just look at the scene in the forest at night. Wasted time with no real action.
Too bad. Possibly it is indeed better in the third part, if someone comes. The air is out for the time being.