Arena is a dangerous place to bot because people are watching you so closely. The bot makes some very botty moves on some of the maps. The bots are also a bit of a pain to manage - they will at times pick different targets and when you try to tell them to pick someone else they don't listen.
Now having said that I have used bots to conquest cap before. I usually play one of the characters so that I can interrupt stuff the bots don't or CC one of the opponents. You also have to queue manually so might as well!
No they will not be competitive.
I use the UltimatePalaHealerBT and for the shaman ShamWow. I've always played as a frost mage (loads of cc / slows escape options) , this is needed because the bot wont do much cc. Dont know if fire will be good.
I always make sure they will start attacking my healer asap (I know the bot can outheal most dps), so I start invisible and rush to them with the bot on follow, then I will sheep / nuke one of them from a distance with the mageI usually hope to take one down before they come after me.
Just make sure both of the chars have good pvp gear (I always fully gear them up with BGbuddy before playing arena).
1550 very nice dks are OPI got to 1550 in the 2v2 bracket with my shaman and a DK on another account. I controlled the DK and had the shaman follow me with lazyraider at 15-20 yds. Not a bad combination those 2!
1550 very nice dks are OPbut how do u get ur healer to follow u that good? mine wasnt following me well and healing me
im using that and my holy pala is getting oom in no time loli gues i have to try out somting else