Not sure if Patrons were around when u made that guide... But dude you need to realise group aoe immobilize is available for brutes, hence BURN RULES... Makes farming so so easy on my fire/fire brute, immob-burn-fsc = job done 

 To get the most outta FA you need to use burn to its fullest and by that, meaning take the group immob  
 
If this has been pointed out in this thread my bad, but i only read ya guide a few replies b4 i had to have my 2cents  
 
Dark/FA makes a very decent "brawler" pvp build too. Personally i prefer my DM/Invun Brute, not very good vs rads or anything that debuffs acc but in a brawl its very very sweet.