I'd say no for the forums but yes on walls.
The whole wall aspect, friend activity and "Home" thing is already like a mini social network site. Add the like buttons to that if they must be added, don't cram the forums with them though.
There will be more arguments caused too, especially when a comment like "lol, Wii is dying" gets 10 likes. People would piss and complain and the forums would go to shit.
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