Webbing up your ally shame on you... context -->" when that NPC lunatic charges behind the line of your sword toting brothers." -- > Its a mild pet peeve I have about those sword toting brothers and reaction being a rather severely limiting thing.
We can go on and on about scenarios. My point is Shield is superior, unless for some reason you are getting targeted in every combat--- well then you are doing something wrong as a wizard. People can disagree, my experience it is the most overrated spell. There is always a better spell to have on hand.
But this post was really about what you think is the most overrated wizard spell, not conjecture on game-play scenarios that can never be fully quantified based on my first opinion.