I don't think any Wii games that run at 30fps and below will avoid the aliasing issue via technological methods, ever. Objects that easily contrast with each other due to color/lighting differences will always bring attention to their edges, and the lower framerate means the ghost frames produced by HDTVs will continue to roughen the perceived image. Nintendo manages to excuse itself all the time because their games tend to have solid framerates, moderate but carefully selected color schemes, non-realistic scenery, and geometry that isn't reliant on sharp linear edges. REDC's aliasing almost disappears when you look at the 3D models from the logbook, running at a higher framerate.
The zombie pups didn't bother me at all. Headshots make them easy takedowns just like the last game.
I think Leon looks different cuz he's still a young chap. He hasn't Gotten Ripped in 4 Weeks yet, and the South America mission has yet to take its toll on his Backstreet Boy looks.
I don't think RC looks too dark. If there's no significant light source, then it should be dark, and I'm ok with that. My TV settings satisfy the brightness checks for all Wii games, and it looks like Cavia's been using the same standards set for REUC and Zack & Wiki.