Oh my have you read these threads lately? Saying to abarr all the time is not the way to go. Since things are fluid rather than constant as my man Manley states, it "appears" that abarr is no longer a staple of a good rotation if you have the AM glyph unless you are doing a mana dump. Dump being on heroism, AP, end of fight etc. Even fully loading the missile barrage is questionable now due to mana efficiency.
It would be a good idea to backtrack and read say the last weeks posts to get a real handle on things. Trust me, its confusing if you just jump in mid stream and you probably dont have the perspective to understand what peeps are saying.
Have a great day and thx much posters here, this is my first post and I can't say enough about this fantastic site.