If 4xMSAA was as free as selnor believe, every 360 games would have been sampled like that since the first year of the console. It's not even free in 720p with 2x...That's why a lot of games have been sub hd this generation (95% of multiplat are lead on 360 since the beginning). U can get a 2xaa ALMOST free in sub hd resolution with the Xenos. Not much more without heavy penalties.
4xMSAA is a different scenario and not free at all, u try that kind of tiling on very light/or predictable engine rendering (sports games, remake,..) that's why i highly doubt Alan wake will perform that kind of sampling, and it wouldn't be a bad thing to me. Remedy has talented graphic artists. I would prefer see them fixing the low res buffer for all atmospherics (looks very odd to me on pics and vids so far)
Heavenly sword was kind of an achievement, but they also had to use a special HDR space (nao32) to limit the framebuffer size, even on PS3, who doesn't really have a physical limitations on framebuffer size (u just crunch on your available memory pool for general rendering, other engine loops, etc..)
Anyway, sampling is not the only important thing, it's part of whole. The way graphist works with their color space, the visual homogeneity, contrast balancing, color correction, can be way more important than sampling a lot to get something really clean. Shaders are also very important, AF and many other things (even LOD). Getting a good IQ is a very complex thing and not limited to one feature like AA.
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