I think the label is becoming more important than the substance, here.
There are a dozen classes. Each has a variety of subclasses which do have substantial impacts on how the class feels. Beyond that, adding race and background differences add a lot more variety. These are highly customizable combinations that cover a pretty broad spectrum. I really have not found a significant archetype, outside psionics, that I can't build... and I can do a fair impression of a psionic PC using wizard/arcane options.