I'd estimate that maybe 5% of pax pay attention to whatever we're blabbing from the front office.
I strongly prefer those CAs who limit their communication to a quick welcome aboard, and nothing else aside from updates on delays or other irregularities. Most pax ignore announcements, or can't understand them, or just want to be left to watch their iPad or sleep in peace.
And while we're on the topic, if you do choose to give a destination weather announcement, why in the name of all that's holy do some guys include the altimeter setting, visibility, the exact wind speed and direction, and exact altitude of the broken or overcast layer? Aside from pilots and sailors, nobody cares or knows what an altimeter setting is. Nor do they care whether it's a broken layer at 2,200 or an overcast layer at 3,500. What's next? A briefing on the NOTAMs?