Testudo is indeed not suited for melee.
Light or Heavy doesn't mean much actually, I thought. The classification as it is, is done so because some factions are set to recruit mostly heavy or mostly light infantry. So most of the classification is done to let AI build good armies, instead of all elites or all levies IMHO.
It is the lethality of the weapons that's more important. see the EDU or EB documentation for that.
Marian legionaries are no superhumans, they are just very well trained, very disciplined fighters.
Artillery in EB is, just as it was in reality, utterly useless and inaccurate against other units. They are for seiges only.
Brihintin (sp.) and even Leuce Epos, Thessalian heavies (as mercs) and certainly Illyrian Light Cavarly are more than enough to use as a hammer! Althought the latter is useless in actual melee.
Edit : and make sure you are playing on Medium battle dificulty, unless you really want to see a whole legion slaughtered by half a unit of Akontistai.
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