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It's not a matter of optimization, but simply correct resolution. The game runs at the native resolution in the gamepad. On your TV, it is running at 720p but on a 1080p screen. The scaling hits the image quality badly and even a very good AA solution wouldn't looks as good as 1080p without AA.

This thing is easy to observe in games that are direct console ports from the PS360 to the PC, without any graphical updates. But only by running the game at 1080p instead of 720p it just looks better and there are less jaggies. I would take 1080p no-AA instead of 720p + TXAA or SMAA anyday. It makes sense since aliasing is an artifact caused by the rasterization process, so more pixels automatically reduce aliasing.

Okami in PS3 used a nice technique where they rendered internally the game in 4K and downscaled it to 1080p and achieved amazing AA results. Mots AA techniques of course are much simpler and consist in some edge-detecting method that wii detect and blur edges in the aliased parts to improve image quality.