From my own share of parts, I had more Gigabyte parts blown up/have problems.
Two graphic cards that burned out (an FX5700 and the replacement did the same a while later) earlier.
A motherboard that was DOA.
Asus for me is a tad better, with one dead motherboard (corrupted bios) only. My other boards all work fine (currently using one with EPU in it, and no there are no weird voltage drops like what others experienced, it stays at what I set in the bios, idle/med load/full load, but then again, different boards, different setup/cpus, so i prove nothing too.)
Does that mean anything? No.
Its always a chance with whatever you get, quality control for every company has improved over the years, but I doubt that only ASUS motherboards have blown up capacitors? The slides above state simply that only Japanese make good capacitors, true? Not really.
Asus lieing? Which marketing tactic is not a lie? Gigabyte's own claims are a marketing tactic as well. Don't believe what each manufacture says, it will always favor themselves. If you believe this without solid proof (currently theres none) then why not go believe Crossfire and SLI always gives you 2x the performance, that Tri-SLI/Quad and CrossfireX gives you 3X 4X the performance?
The key words in any marketing is "up to" the 80% statistics that ASUS measured was simply in optimal configuration favoring themselves. Gigabyte tests were also done in optimal conditions favoring them as well.