[douglas]

Full ship and fleet training plus better racial combat bonuses versus no training is a no contest victory for the trained ships every time, assuming equal tech. Especially if you're using stealth and scattering armor as well as ECM on your ships and with the light cruiser size bonus added in, I wouldn't be in the least bit surprised if his ships hardly ever hit even at point blank range. Tell your opponents to stop complaining, research Military Science 2, Advanced Military Science 3, and train their own ships and fleets. That's the only way they'll ever have a chance against you, and it's something practically every good experienced player does very early in every game.

Edit: here are the numbers, assuming max relevant tech:
Your defense bonuses: 10% size + 60% ECM + 15% stealth armor + 20% ship training + 20% fleet training + 10% racial = +135%
Their offense bonuses: +65% CS
Net effect: 135 - 65 = 70% penalty to hit. At point blank range, their ships can only hit with 20% of their shots. At range 2, 10%, range 3 and greater, 1%.