I always wondered just what were they thinking when they decided to summon Heracles as a 'Berserker' of all things. After all this is the guy who (supposedly) fulfilled the criteria for EVERY Servant class except Caster.
Seriously, they even went out of the way to summon him before the 5th HGW even started just to make sure they got him, and everyone knows that Archer's are alway's OP....