I also wonder what it does to your battery leaving it on all day? It seems like that is what you would want to do. If you are not logged in, you do not get the notifications until you log back in.
You're not "leaving it on", you just remain logged in, no different than Talk remaining logged in. There is no battery impact.
Yeah seems all a bit 'over promised' really.
Overpromised by who? I don't recall anyone promising you anything.
I mean at the end of the day it would still require me to go through the 150 contacts and get them all to install google hangouts on their own smartphone, or computer and sign up for a google account. That isn't going to happen. I have 10 people on my phone that have bothered to sign up to Google+ and then they aren't likely to ever get google hangouts either. Given we have free carrier to same carrier text messaging anyway.
If they are using an Android phone, you don't have to get them to sign up for anything. Whether they still have Talk or Hangouts, it still works all the same.
What we truly need is a 'real' cross platform messaging service that takes the wide range of messaging apps and unifies them into 'one' messaging service. So that one app really does rule them all, and that was something we were led to believe 'Babel' actually was.
Who led you to believe that? I don't recall Google EVER tell you something that ridiculous. That's an expectation you developed on your own.
The fact that it isn't and it just basically replaces google talk and google+ messenger is a bit of a major letdown if I'm entirely honest.
See what happens when you listen to blog sites and let them get you all amped up? The purpose of the initial release was simple, unify the messaging on Google platforms. In other words, it's purpose was to make it so you didn't have to use G+ to message one person, Talk to message another, etc. Blog sites and everyone else to the leaks and ran with it, creating these visions of grandeur. You let yourself down. More functionality will come to it down the road, but from the beginning, the initial release's purpose was simple and clear.
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Now you see what I meant about leaks creating expectations that lead to disappointment? You've got people in here acting as if Google promised them something, and released something else. What was released was exactly what was planned to be released, but because they listened to blog sites, they had these visions of grandeur in their heads. lol MacRumorUser even went as far as to call it "overpromised", when nothing was ever promised at all.
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That's the problem with Google though, tries to focus too much on too many product and then they just close down two years later
With that mindset, there would be no Gmail, no youtube, no Android, no Blogger, no Google Maps, etc.
And hangouts is going to be a poor man's iMessage
Sorry buddy. Why should I go around giving people my Gmail address when I can just use my cell phone number and if people have an iPhone it redirects to an iMessage? Let me reword that, it doesn't have to be cross-platform because it just works.
You don't have to give anyone your gmail address for Hangouts. Perhaps you should become a bit more familiar with what you're talking about, if you are going to address it.