Most Over/Underrated Class?

[MrStabby]

But you can't learn them all on one wizard! You only get four third-level spells in your spellbook unless you're willing to give up fourth-level spells or higher or you get lucky finding spells "in the wild."

Well that is the other side of what we see. How many extra spells does a wizard pick up along the way for the spellbook?

You can do a lot with the wizard if you can collect rituals for your book as you go along campaigning. If you never meet any other wizards to copy from/kill or any other sources of spells then you are a bit more limited.