Specific abilities, such as the flamelit pikemen's Damage over Time ability, are unable to critically strike.  This is a bit of a handicap to many, but is an especially huge handicap to these troops, since their ability is based on critical strike chance.  This causes the player to focus on critical strike chance for them, only for that critical strike chance to not actually cause their most important source of damage to gain critical hits.

You should work on fixing it so that all sources of damage can gain critical hits.