I run three helbrutes regularly, and while they've never been stellar, they're good medium brawlers able to hit a good range of targets. Obviously, they're best in melee, but they can be a bit difficult to get there (8W gets shredded surprisingly fast!). I built mine in 7th, so they're not exactly optimized, but I'll give my insight. In my experience, shooting is just something extra while they do while they waddle up the field to punch things. They're sort of terrible weapon platforms (outside of the las/missile or blastmaster)
Reaper Autocannon: It's cheap, but it's trash. Chaos got the crap end of the stick with reapers being 1 damage, as it completely negates their vehicle killing role. I (sort of) get why Terminator reapers are... smaller. But why all the vehicles also get stuck with these anemic weapons is really dumb. Twin heavy bolters are better in basically every way.
Plasma Cannon: HOT trash. Avoid this thing like the plague. With only d3 shots, it's basically a single plasmagun, and because it's heavy it overheats on a 1 or 2 when you move. You can occasionally frenzy to shoot and overheat again. If this thing was d6 shots, maybe it would be worth the 30 pts, but right now... naw. I only modeled mine because it looked cool. I should start using it as a blastmaster.
Multimelta: Probably the least disappointing of the 3 i use. It can be hit or miss, but when it does hit, it packs a nice punch. Mixes well with the melee arm when youre closing distance.
|