Wing Commander CIC

I'm new to the WIng Commander universe. I ve only played WC1, SM1, SM2, Prophecy and Secret Ops. Now from what I've seen the Wing Commander Universe is almost devoid of captial ship engagements. The games are almost totally dominated by fighter actions. In Secret Ops there is one mission where the Cerberus can move in close to an enemy capship and engage it but the nephilim capship is always destroyed by the bombers. It seems a little unrealistic to me. I dont know if it is like that in the other games but beyond launching capship missiles it seems as if capships are basically big mother ships for the fighters. Can some one give me some info on capship combat in other games and capship weaponry. Also why are the Nephilim capships basically armed with CSMs, maser turrets, and IR missile turrets. Shouldnt there be some variety especially among the different ship classes