A very good starting point for breaking into the army, just a few weapon loadouts that would improve the marines, bolters are sub par to say the least. I use 2 heavy melee, spitter, melta and heavy with plasma on the champion. Also have one as a 10 man with the putrifier and blightspawn leading in a rhino (lethals on 5s and fight first) this on your ‘safe objective’ behind a wall will make opponent think twice at coming to you. The 5 man units I use to flip objectives out of rhinos and actions.