Like every other class, Ranger require Speed and Constitution for AP, but instead of having only 1 attribute that determines the efficiency of their skills and which weapon they can use, they have to put points into Perception as well. If you want to multiclass as a Wizard, that means you are forced to invest points into Intelligence as well, which seems way harder than just relying on 3 Attributes.

I guess you could only invest a few points into the casting skills and use the low level buff spells, like Bless and Oath of Destruction + some Summons.