End of the day comparing the two, MSAA and moreso SSAA, look noticeably better than any implementation of a post-AA filter will with any amount of tweaking.
Crysis 3 has the best implementation of post-AA filtering I have seen and still looks better with MSAA instead of using the other AA modes where some use a pure post-AA filter and others varying degrees of actual anti aliasing mixed with the usage of a post or other filters.
http://www.hardocp.com/article/2013/03/12/crysis_3_video_card_performance_iq_review/8
Post-AA filters are not altogether terrible but they are not in the same league as MSAA or SSAA if you are particular about not having any texture distortion/loss and enjoy a crisp image. Then you have one of the most damning statements I have seen about an AA mode that incorporates the use of a filter that comes later :
http://www.hardocp.com/article/2013/03/12/crysis_3_video_card_performance_iq_review/9
I agree using AA filters has its place if you are trying to get better performance and that is the main point of post-AA filtering; good enough for minimal performance costs, but not as good as the other options. Post-AA and AA filters do not provide the quality of MSAA and SSAA if available. Still the use of a mix of true anti-aliasing and a filter can deliver a pretty good result like you see with SMAA manage in Crysis 3, it's the best use I have seen, but the blur/texture reduction is still there.
Then you have extremes like TXAA using a mix of anti-aliasing and its own filtering technique, which completely destroys image quality. Hopefully Crysis 3 is the last we will see of that garbage now that Crytek is part of AMD's gaming evolved.