Marza's are the TEC AoE ( Area of Effect ) ships, and one of the best single ship on single ship caps in the game. Once Leveled up, they have splash damage, radiation bombs, and missile barrage, all of which can hit multiple ships or cause continual damage. No suprise your LRM fleet got stomped. A few radiation bombs and a missile barage or two and I bet they folded like cheap paper, leaving the Kol alone. Where you got hosed was the AoE damage. straight ship-to-ship DPS and the two fleets were about even. I bet radiation bombs were eating LRM's like a ten year old on a bowl of M+M's..
Buy the time the AI has two Marzas, you should have a few Caps of your own. Sometimes, while hard to swallow, retreat is an option. You should have at least saved the Kol. You might try to concentrate on killing one Marza and then bail before you lose the Kol. I will usually retreat with the remains of my fleet rather then stay till the bitter end. A few LRMs and a beat up Kol is still the core of a new fleet.