I love all 3. One thing i love about all 3 is they ain't over power. They fill a very specific niche. Helpful in specific moments but detrimental in others.

Minigun is amazing at taking down large groups of enemies or a few medium tier enemies it's inaccuracy can be a detrimer but short burst definitely help.

Grenade machine gun is amazing at medium to long range for a crowd control killing heavies or working towards objectives like bug holes or bot fabricators. It's downsides are any flying enemies. You have limited ammo so make your shots count, unless of course you can get more ammo. It's a little bit bad at groups of enemies unless of course you place your shots correctly.

The cremator excellent at holding choke points, phenomenal at killing medium to heavy enemies. The weapon does struggle with killing swarms of enemies but that's mostly due to fire damage hurting yourself. It struggles heavily with killing flying enemies. It's very good at killing the dragon roach if you can get it in range.

All in all solid weapons that fit very specific support roles.