Jürgen Hubert
First Post
It all depends on how you define tacked on vs core. I can play a druid with the 3.5 core books... can't with 4e. And the only reason I will be able to do so in the future (after PH2) is because the concept of "core rules" has been redefined to include what 3.5 covered in splat books.
I always thought that that redefinition was rather silly. So I will state that the core rules of 3.5 support druid player characters while the core rules of 4E don't.
Though I do think that the 4E rules are the system that's more fun...