I'm sorry, but this guy did have an axe to grind, every flaw he pointed out in the m8, I have found in ma lil ladies 5d and mkIII, and I mean every single flaw. The flaw that he didn't bring up which suprised the hell out of me was the fact that the battery life is so terrible in comparison to his so called "better" canon...I mean, seriously, the one flawless quality of my wifes mkIII is that the battery just goes and goes and goes and goes (well the autofocus goes and goes too, always searching for focus confirmation...3 times it's been back to canon, still doesn't work right.)
The fact is, every single camera has flaws that come into fruition when put under severe distress such as combat photography, however he was just parroting every single freaking flaw everyone has known about since the freaking camera came out...speaking of which, he obviously is too inept to upgrade the firmware since he was still complaining about white balance issues.
I've put the m8 through it's paces myself, it's been soaked in bleach, covered in volcanic ash, and dropped in a pile of dog $hit, and the only problem I've seen with it was the stupid on/off switch going to self timer land.
Handled correctly iso 2500 is perfectly usable...in fact i just received today 25 13x19's shot at 2500 for a gallery showing this summer, now...they ain't as nice as the D3's high iso files, but then again the D3 just came out, and they are only marginally worse than the 5d's high iso files.