Shielded Sides is +2 to AC and Reflex Defense when wielding a shield, right? I personally like that one.
"Come and Get it" -> Action Point -> *insert other close burst power which name I forgot" -> Oops, now I am surrounded by several foes that are pretty annoyed about what I just did to them -> Shielded Sides.
That's exactly what my fighter is planning on doing, with the added bonus that he's a human with Action Surge going for Swordmaster (so an additional +3 to hit and +4 AC/Reflex when he whips out the action point). If you try, you can get quite a few Close Burst powers as a fighter that you can last a few rounds in the swarm if need be.
But unless this is your playbook, Shielded Sides probably isn't for you.