Hopefully there is something I am missing but so far as we have been playing the DA devastator has been very overpowered. He simply brings his heavy bolter, his bolt pistol with hellfire ammo and a missile launcher with several krak rounds. No matter what I throw at him he mows it down and the rest of the party simply cannot keep up. His heavy bolter murders hordes and single tough enemies with ease and he kill bosses with no real trouble using his missiles. With his HB he only has to reload once every 25 rounds of combat. When I ambush them in melee with genestealers or something of the sort he still manages to kill at least as many enemies with his bolt pistol as the other marines since it is so effective in close combat. The rest of the party is a UM librarian, a Storm Wardens Assault marine, a BA tech marine, and a BA apothecary.
How are all of you dealing with devastator marines? Is there some piece of the rules I am missing?
A team with 4 or 5 HBs would have to be considered overkill on most missions.
. That said if you let them take their career of choice and you've got 2 devs and 2 librarians, you'll just need to take a little more time in planning out your encounters- making sure the devs have plenty of tactics to think about when chewing through the hordes, and plenty of terrible creatures to keep your psykers busy.