The overall picture that I'm getting from this thread is this:
1. The overall premise "low level wizards really do suck in 5e" doesn't stand up.
2. If the premise had been that "low level wizards can suck in 5e combat" then there is certainly some evidence for that
3. But combat isn't normally all there is to D&D, and low level wizards have always been sucky in combat.
Yeah, I was probably talking more about #2 than #1. Course, we are playing HotDQ and due to time constraints and such, we have had very little in the way of "out of combat", a lot less then we normally do.