Will say it again...
Your part of the problem judging by your attitude....
Fact that you start to point fingers after a few wipes (yes this is a few wipes) is clear proof, also it doesn't help that you first started to blame the tanks and now the hunter and priest.
Your doing heroic modes....your going to wipe and your going to wipe allot. If you can't accept that fact then I suggest you find another guild but that is farming the content. Also just so you know all of the top guilds in the world wipe waaaay more then 130 times even though they wiped a thousand times after practising the bosses on PTR.