I think it is a little long winded and slow to invite someone to your Fireteam, since there is not proximity voice chat it would be nice to press a button and quick select someone to invite to your Fireteam without ever leaving the screen, as soon as i go to options my view of incoming enemies etc is gone and i could be shot any minute. This would make it easier and encourage social playing.
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Maybe I'm missing something, but it's also really easy to miss an invite. Last time I looked I had a screen full of expired invites I never knew about. There should be some kind of graphic pop up, even if its just In the regular menu and not on the HUD. I would prefer the HUD though