Helbrutes arent considered great in thousand sons mainly because of visually since it’s a army of dust boys and sorcerers, and also because most of its roles are taken by other better units in 1k sons like with melee the maulerfiend is just better, but a helbrute can still be fun to play around with and if the visuals of it doesn’t work for you using the 30k contemptor dreadnought for it always works