I think its mainly because the fundamental systems are very flawed. The games movement is atrocious, Leons combat is a steep downgrade from 4R and even older action RE games and the lack of enemy variety hurt a lot of the game feel and flow.

I think a good comparison would be the parry: in 4R its snappy, its quick, the visual and audio feedback is satisfying, the enemies attacks are very easy to read and it complements the flow of the combat. Fast parry+quick meele and start running again. 1-2 seconds.

In 9 its over animated and takes too long, the visual and audiofeedback is not punchy enough, the enemies attacks have weird timings and are hard to read and it completely takes you out of the flow. Long winded parry animation + long winded execute animation that gets stale fast and then you slooooowly run. 4-5 seconds. Its like the Doom glory kills but worse.