I'm not a DnD player but what Blackheifer said sounds very convincing. I see a scroll more as a replacement for a spellslot, not the whole spell. I don't know why anybody can use them and so diminish the relative worth of spellcasters. I also think that the multiclassing nonsense with the possibility to abuse the Wizard dip has to stop.
The only real problem of the Wizard class for me is that there are several very subpar subclasses. But that's a fate they share with other classes and subclasses and what is probably not to avoid in such a game with only a restricted number of working effects.
