If you are having problems with these bosses, feel free to check the decks that I've made:

Patchwerk:

http://www.hearthpwn.com/decks/88309...roic-patchwerk

http://www.hearthpwn.com/decks/88295...roic-patchwerk

Grobbulus:

http://www.hearthpwn.com/decks/88388...roic-grobbulus

http://www.hearthpwn.com/decks/88356...roic-grobbulus

Gluth:

http://www.hearthpwn.com/decks/88420...l-heroic-gluth

Thaddius:

http://www.hearthpwn.com/decks/88484...eroic-thaddius

Good luck!