I find Google Now to be extremely useful, and for the few things I don't use I just disable them in the settings.
We get tons of packages here at the house, and UPS never knocks on the door (they just toss the boxes on the steps). Thankfully I know when packages are delivered since Google Now tells me. Saves me from running up and down the stairs every few minutes to look outside for packages.
My boyfriend works out of state, so every week there's plane information I have to keep track of. Google Now does this for me and I know when/if his flight is delayed before he does.
I also love the nearby events card. Let's me see if something interesting is happening (concerts, comedy shows, sporting event etc) that we may wish to go to on the weekends.
All in all I rather enjoy Google Now. Sure it needs polishing, but considering it's still a fairly new app I think they've done outstanding.