I suggest the Devs Balance the defence powers for tankers.
Check out all the build the "Power Gamers" are talking about and you'll see certain armor types NEVER talked about.
Even if your not a power gamer and don't slot purples or even IO Sets. No one that plans on tanking the higher end (40-50) and have done any amount of research at all would consider Dark Armor, Ice Armor,Fire Armor etc. no one would would want to sacrifice a DPS slot on their team for a second or third healer.
And what's with all the melee attacks in the blasters secondary?
Blasters are the Wizards of other MMO's and in other MMO's I dont see too many getting into melee as a desired effect. All be it, at low levels it sometimes comes in handy and perhaps getting 1 melee attack might be good for IO sets or whatever but 4-5 attacks? They are very useful if ya intend to get all your debt badges by lvl 30.