i'm not sure if it's considered bm to use like eth weapons for massive dmg in llds

Not if they're eth/rep.

in pub games no1 really cares and people do buy eth items for fun dueling. If it's a tourney though it's BM.

Most commonly you'll see people buy eth partizans (4 soc for insight) or eth bonesnap mauls.

I've actually got an eth martel 2 handed weapon I was thinking of 6X shael for a fury druid build
It has like 160 2-hand dmg without any ED %

Its normal+encouraged in hardcore, you need a rare with replenish/repair dura to use them goodmannered in softcore.