While i prefer V, i hate a few features which i preferred in IV.
no jumping on the spot
no hanging onto things because you instantly climb
cars explode if they land on anything but their wheels
flipping cars while being upside down
the multiplayer was better in IV for some points like free roaming
you die by like 3 pistol shots but the enemies however survive multiple carbine shots
enemys always aimbot to your head, they hit you perfectly in a moving car at all times
the cops are overaggressive
I could go on and write a whole book of things i dont like but.. no.
The game itself is too easy overall, in my opinion.
Please read the OP, this topic is not about things you preferred in IV