From what I understand, a lot of people have praised RE4 for its new non-fixed camera, which also affects the controls, and also the abundance of ammo.
I know I'm in the minority, so I have no right to "complain," but I really loved in, well, especially 2 and Code Veronica where part of the "survival" in "survival horror" included strategically using your ammo. In other words, using handgun ammo whenever possible to avoid using "better" weapons, not killing some enemies you can just run past, etc. The lack of ammo in these other games, combined with the very non-linear gameplay, made the entire weapons system a big part of the spook factor. I remember, and I recall this for friends, as well, getting extraordinarily scared when I was almost out of shotgun shells, or the tremendous relief one felt when finding those golden magnum bullets later in the game.
I'm not saying that "fixing" these things is necessarily a bad thing for the game, I just find it curious that I've been selling off ammo the whole game to avoid having to discard it.
By the way, in this "Professional" mode that I keep hearing about, do you get less ammunition throughout the game, or do enemies take more damage before they die? This would be a very compelling reason, on top of the other goodies I've been hearing about, to replay the game.