it really depends on what you want. I like HOI 4 and the accessible mods fix a lot of issues plus make some awesome events.I've been waiting till now to get a HOI game, but, given the massively negative reception, should I just get HOI 3?
Germany as a Monarchist nation protecting Yugoslavia from the terrible forces of Italy with the forces of Czechoslovakia and Greece at my side. Plus outnumbered 2-1 by the cruel Italians because I have 14 divisions going after Italian territories.
But overall you might want to get HOI3 for now until some of the bigger issues are fixed.