Hey Shadow, So i'm looking through the deck right now and i'm running into 1 problem and 1 problem alone... too much reliance on the planeswalkers. they are powerful if used properly but they need to be guarded by creatures first. the only thing you have to protect yourself from creatures is sorin's first ability. but that's only if they don't have more then 1 creature out. Not to mention only being able to play 1 of each of them at once is a huge risk! my buddy had a similar deck, and my Boros deck slaughtered it because he couldn't defend against creatures easily. you do have instants and sorceries to protect yourself for a bit but even that has weaknesses. i would suggest adding at least a couple creatures. maybe some cheap drops or a couple token producers just to keep a guard up.
if you want to see what kind of deck you need to be wary of this is my Boros deck
http://deckstats.net/decks/1550/4013-the-legion