There's a strange polarity among the Roman soldiers. In Blood and Sand, the Gladiators seems to mostly respect the local Roman guards (granted, it's because it was a numbers game, but you never go the sense that any gladiator thought he was an obvious match for any guard with the exception of Spartacus). Spartacus' victory over the guards with the wooden swords, for instance, surprised nearly everyone. In Vengeance, the guards seem almost buffoon-like.
So I'm having a hard time if anyone should really care about the average Roman guard (or legionnaire or whatever they may be). Maybe they're waiting to introduce the really bad-ass elite Roman guards the way they've introduced Ashur's elite killers?