Yeah HTC have only really got better in the last year with battery life on their phones i.e. one S, XL, DNA all have great battery life, same league as GS 3 (the x would have been a lot better if they didn't use tegra 3)
Well it depends entirely on the video format/player, screen brightness etc. that they use i.e. here is gsmarena's test of the dna:
http://www.gsmarena.com/htc_droid_dna-review-853p2.php
IIRC they set screen brightness to 50% and turn airplane mode on for the video test.
Also the verge were streaming content from netflix rather than internal storage (think gsmarena do the same too) like the site I linked to, so that will be even more demanding hence why it is probably much lower, not to mention other factors i.e. with sense there is a wifi "max performance" mode, which absolutely hammers my S battery and have found that it doesn't bring much, if any extra performance to wifi related tasks so they could have very well had that enabled as well.
As for verge's browser battery test, that is rather on the low side still IMO (impossible to tell really due to not knowing other factors), I wonder which browser they were using, chrome or the stock sense browser?
Will just have to wait and see more reviews i.e. gsmarena and anandtech as well as user reviews on battery life (which give much better idea as to real world usage)
Voice signal is just as demanding, if not more than those things (mobile data connection is even more demanding), turn on airplane mode and see how long your phone lasts
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And 1 hour of phone calls will usually always be listed in the top 1-3 on the usage chart. CPU chipsets these days are very power efficient, only time they will really suck battery life is during gaming/intensive tasks. Biggest drainers are:
- screen
- voice signal and data connection (3G/H/4G)
- GPS
Syncing can also hammer battery life if you have too much going on and refreshing too often.
Software optimisation is one of the most important factors too i.e. look at the nexus 4 battery life when it had 4.2 and now look at it with 4.2.2, one of the best phones for battery life.