Ugh... I think Microsoft tried (and wants to) put in the same bag as much people as possible with the XBox One. Just like the Wii did at first with the "casual" games and first party "hardcore" games (yeah, whatever).
It is not a bad thing when done right, yes, but then you'll have a "jack of all trades" instead of a "gaming machine". I'm not an advocate of putting too many specific functions into one device until the technology is up to par with the individual ones. Smartphone cameras is a fine example for that: today we find "good" picture quality compared to a Point and Shoot and it will get even better down the road thanks to tech advancements. In the case of consoles, I expect SteamBox to trash everything else in the living room gaming wise first and other-stuff second, including the recent-out consoles. There's a world of horsepower of difference between the custom APUs and using an Intel + nVidia/AMD video card with an optimized OS (SteamOS, remember?).
I'll need a first hand experience with the XB1 and the PS4, but as "consoles", they must not disappoint. Kinnect is a feature you should/can put in a PC/HTPC with little effort if you want one (we're in a tech site, so this phrase is valid). Same for the EyeToy. Hell, even speech recognition used in the XB1, I'm sure is a derivative from the one in Windows that anyone can actually tune and use.
Cheers!