I'm 6'2" and have a large Blood. I read that Dirt review just before I got mine, but came to the conclusion that Steve Jones isn't massive, and went for the bigger size. I have to say I haven't regretted it for a minute, just back from doing the Mega on it and it was amazing. It's no marathon machine, but that said I'll happily pedal round a trailcentre loop or Highland day out on it.
I've got a Gravity Dropper post that looks precariously long when in the XC saddle up position, but my (shorter) mate's small Blood looks just as fragile with the seat up (it's not, they were both hammered in Alpe d'Huez without missing a beat).