Yes and no.
I assume you mean marine heavy bolters in devestators. Or on chaos havocs. As opposed to heavy bolters on razorback, landspeeders, attack bikes etc
Devestators see some competetive play, but often with multimelta in a drop pod.
The heavy bolter profile is good at killing marines. Because it deal 2 wounds, and marines have 2 wounds. But it is less good at killing 1 wound models and damage - 1 models.
It's biggest competition comes from bolter inceptors, devestators with grav cannons and contemptor dreadnoughts with volkites. The last one used to be a mainstay in marine lists until nephilim messed with the CP.
I hope this helped. You certainly can build good lists with the heavy bolter, but no cutting edge tier 1 army list is currently doing it. But the sky is the limit.
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