But Swordmages are Defenders...Truthfully if there is that much of a difference between the defenders and the 'squishy' targets AC they deserve to be beat on. You want your defenders to have an ac not all that far from the softer targets to make it much more viable to attack the defender instead of ignoring them. As far as the Avenger having high ac, I find it interesting that people complain about Avengers but not Swordmages, who have their Primary stat boosting AC as well as a class feature providing the same boost to AC as the Avenger.
Truthfully if there is that much of a difference between the defenders and the 'squishy' targets AC they deserve to be beat on. You want your defenders to have an ac not all that far from the softer targets to make it much more viable to attack the defender instead of ignoring them. As far as the Avenger having high ac, I find it interesting that people complain about Avengers but not Swordmages, who have their Primary stat boosting AC as well as a class feature providing the same boost to AC as the Avenger.
The bonus is variable, depending upon the weapon that the Swordmage uses. Go two-handed and you lose two points of AC. It also drops if the Swordmage goes down.
Have you ever built & played a Swordmage for any length of time? Feats are a prescious commodity for them especially. There are VERY tough choices to be made.
Wildly off-topic, but: IME, Swordmages are quite difficult to build effectively. They just aren't an easy defender class to play....so I'm not sure the comparison to the Avenger class is useful.