I've only had to call Nintendo support once in the 30 odd years I've been using their toys and electronics (dating back to the original pre-NES Game and Watch series).
It was for the launch model 3DS I pre-ordered back in 2011 which managed to clear QC with a dead speaker as in it was dead before I ever turned it on. I was disappointed by the lack of volume in the new 3DS (worse than my old DSl) and it took me the better part of 2 weeks to realize it was because one of the speakers wasn't working.
Called Nintendo service, spoke to someone who sounded like a middle aged mom and after confirming the speaker was dead with my prepped tests, they sent a 3DS coffin to ship it to them for repair. Don't remember the exact turnaround time, but I think it was the better part of a month.
I've had tons of experience with the SCE service department as I've shipped three PS3s back for refurb replacements for YLoDs and a 4th that I never sent back to SCE after crating it up. They're always easy to work with so the only exasperation on my part is the fact that I have to call them once again for broken hardware that was well maintained.
Before that, I've had one dead PS (original launch year model) that worked upside down for quite awhile before finally giving up the ghost. Never called customer service. I ended up buying 4 PS1s over the product lifecycle but only the first one died.
Ironically, my 2007 Xbox 360 still works fine; never had so much as a hiccup, being a relatively low use console and so I've never had the pleasure of sending in a RRoD console for replacement. If it broke today, I wouldn't mind at all and would simply buy a new one.