Once they fix battle shout to work the way it did in vanilla you can effectively generate more threat than a sunder, but on every single enemy at the same time and for only 10 rage (dependent on how many friendlies you hit with battle shout)!
Demo shout was bugged to multiply threat based on number of targets effected, but I believe that was already hotfixed (though only from talking to warriors, Blizzard hasn’t stated it yet). They stated Battle Shout was also going to be fixed/changed to work the way it did in 1.12, which will actually be a buff to threat I believe when/if that hotfix happens.
The statement about battle shout/healing etc is a bit unclear because he doesn’t indicate if that will result in an increase/decrease, but from what is known about how battle shout should work in 1.12 and the fact that it wasn’t nerfed until 2.0.1 (see 2.0.1 patch notes), it seems like it should be buffed compared to what it was doing in classic.