I would say that if the failure rate of Brawl gets up to even 1/3 the rate of MS RROD, then Nintendo definitely has a problem. But it's nowhere near that rate or we would have heard from Japan very loudly.
Nintendo had an issue before with the WiiRemote breaking stuff, you might recall. It happened often enough to get a lot of attention. And Nintendo deal with it. Stronger straps, the bubble wrap, now it doesn't make the news anymore, does it?
It sucks to have anything go bad, but things do. So then you look at what the reaction is, if any. MS reaction to RROD was so poor, and the failure rate so high, people got on them.
If Brawl's failure rate is low, Nintendo gives a number of ways to fix it or if it can't, then they fix it free for the user, and it is shown that most of the causes (smoke/excessive dust) is user error (similar to the throwing of the wiiremote), less are going to attack Nintendo as being at fault.
Just as few would blame Sony, if you took a handfull of sand and poured it into the PS3 game slot. I would hope that most would consider that as 'user error' at best.
Torturing the numbers. Hear them scream.
