not if you stick them in heavy cover. Their front armour is good as well so as long as they don't get in CC or flanked they'll be fine.
Eldar lance weapons will make a mockery of any armour you take, and nids MCs in combat will destroy your tanks, but you need a way to deal with MCs and tanks.
I don't have the BA codex so can't comment on what you should take intead if you don't want tanks
Eldar lance weapons will make a mockery of any armour you take, and nids MCs in combat will destroy your tanks, but you need a way to deal with MCs and tanks.
I don't have the BA codex so can't comment on what you should take intead if you don't want tanks