How do you feel about guardians with focus spells?

[SoulBaker]

I know this is against the spirit of the full martial narrative we were initially presented with and I'm not convinced that it makes sense, but what do others think?

Specifically I am thinking a guardian could gain access to focus spells through feats like a ranger can.

What I was considering would come in 2-3 flavors
-movement control (pulling enemies and making difficult terrain etc.
-damage reflection
-shouts that inflict sonic damage/conditions