What I don't get in the discussion above is why you are discussing if a single Ogre is a threat to a complete level 10 party.
Because [MENTION=6689033]Steely_Dan[/MENTION] said "an ogre ... will still be a threat to a 10th level party," and "Anyway, what I said holds true, a monster with +6 to hit and 2d8 + 4 damage is still a threat to a 10th level character in 5th Ed."
"An ogre" isn't going to be a threat to a 10th-level party, because, as demonstrated, it's not even a threat to a single 5th-level fighter.
Accordingly, while the goal of bounded accuracy is that you can throw a bunch of lower-level foes at your 10th-level party and they'll be a reasonably serious threat, I'm not seeing it with the current (or even 1st-version) playtest ogre.
In 5e it looks like the addition of the 6-12 ogres will change the encounter dramatically. In earlier editions (3e, 4e) they would most likely be just cannon fodder unable to hit except on maybe 19 or 20 on a d20, and hittable on a 2 on a d20.
I'm not sure they aren't going to be cannon fodder in 5E, either. Against a completely mundanely equipped level 5 fighter (who is not even using the best gear available to him), they're only hitting on ... 14, IIRC. Sure, maybe they can mess up the wizard in close combat, but we haven't seen the defensive spell a level 10 Wizard would have (and something like, say, Stoneskin would put a crimp in their damage output).
At 32 hit points, I don't think they'll have a whole lot of staying power at that level, either - a 5th-level fighter is already dishing out [W]+2d8 damage, if he wants to, and a similarly-leveled rogue is sneak attacking for [W]+6d6 on a Sneak attack.
Essentially, I laud the goal of bounded accuracy, but I don't think what we've seen so far establishes that it is in-game and working-as-intended yet.