the aim in the original was pretty much perfect... not sure what you thought was strange about it tbh.
Ok, I have retested the original RE4 on my PS2, X360, PC, and also GC version on the doplhin emulator.
In all versions the laser sight is constantly swaying, making it harder to aim, so no matter what version of the game you were playing, you must have had some difficulty with the aiming.
-PS2 version has the worst aiming. If you push analog stick your laser sight starts moving very slowy but then at certain point it accelerates too fast, so aiming in general is very difficult.
-Both PC and x360 version have the same aiming, and the only difference is PC version runs at 60fps, so it's a little bit easier to aim. Compared to PS2 version acceleleration during aiming is way less noticeable, but it's still there.
-GC version has the least amount of acceleration during aiming, but maybe it has something to do with my X360 gamepad settings, because GC thumbstics had differente range of motion and different precision for sure.
Overall, my opinion is that the aiming is the best in the GC version. Headshots are easier and it seems game is much more generous when it comes to supplies because enemies drop insane amount of ammo.
So since the aiming in the original RE4 was already difficult it make sense why they wanted to preserve this aspect in the remake. Keep in mind in the remake you can also move while aiming, so maybe that's why they wanted to make it even more difficult.
If someone wants to improve aiming on PC I recommend using "duranzo", thatnks to it you can edit thumbsticks deadzone and acceleration.