Hi Brazouck (and welcome),
don't forget that "I'm Spartacus" card also lets each activated units roll 1 additional die in that turn.
You can see fulltext here
http://www.ccancients.net/Rules/Base-Game/base-game-card-list.html
Roll dice equal to command. For each unit symbol rolled one unit of this type is ordered and a leader symbol orders any unit or a leader. Units may be ordered in any section. Ordered units battle with 1 additional die this turn. Reshuffle Deck and Discards.
You will activate units with 4 die results on 6... that's not so bad.
I know that you can roll all red even if you only have light/medium units... but that's the trick!
Morever this card let you reshuffle discard pile into the deck, maybe searching for some good cards your opponent just played!
Give this card some more chance and maybe you will find how to best fit your games.