If you can clearly define what All Mountain means then you could determine the suitability of the bike for that description. But for now, one man's AM is another's technical XC section or full on DH to another. Right now, somewhere in the French Alps is a guy on a fairly basic but tough hardtail that will not only beat you to the top of the mountain, he will also beat you and your 6" dually with the latest "must have coz Fabian Barel uses one" widgets comprehensively on the way down. That's just his standard "I'm going for a ride with me mates, see you at tea time".
Giving aspects of our sport specific categories like this is simply creating a solution to a problem that never existed. A bit like those idiotic adverts on telly for women's pads that help to "avoid sweat patches in areas that you might feel a little embarrassed about even though for the last few hundreds years nobody noticed or cared. But hey, we've got you thinking about it now and perhaps you're a little paranoid...."
Are you worried that your bike is not AM enough? Maybe you should get an additional or replacement bike with slightly more travel, a degree or two slacker head angle, a bottom bracket dropped by .35 of a nanometer, 13% more wank factor and a plethora of other options.
Don't worry. In a couple of year's time there will be a new definition of AM or a new category (enduro perhaps) that will add further choice or confusion and make you change your mind again.
If the bike companies manage to get you thinking about it, then discussing it in forums like this, Pinkbike, Vital etc, giving validation to it, then buying into the idea they will continue to push and create more reasons to empty your wallet. The fact that this thread exists is proof.
It's all subjective and ultimately pointless. It's just off road riding at the end of the day. Some bikes will go up better, some down better and some do both quite well.
The truth remains that most of us could spend less time on these forums, less money on new crap that we don't need, bought with money we don't really have, to impress people whose opinions don't really matter. We could (and probably should) direct our efforts into learning and improving our techniques, getting fitter, dropping body fat and gaining strength, handling an already good bike more effectively, reading trails better and getting out to build or maintain trails.