no no it doesn't, It adapts to what you do, learns, and changes its plays and strategies over the course of a game. If I can go on a 10 game win streak with sim settings on superstar, ie shot accuracy 1, shot power 2, and the cpu learing and aggression maxed etc., the ai is certainly not cheating. Littman has even said numerous times that there is zero catch up logic in 08. Some people just refuse to adapt and change their strategy when the ai learns to shut them down.
Dump it in and forecheck, play solid defense, (yes I realize its difficult but it CAN be done) and don't just skate into the zone and shoot or one timer it, work it around, make some create a plays etc and switch it up.
It also drives me crazy when people complain about the scoring in the game, I get varied goal totals for both user and cpu, my last 4 games were a 2-0 loss, a 3-1 win, a 5-2 win, and a 4-1 win. I've had games where the cpu blows me out 5-0, games where I'm down 2 goals in the 3rd and tie it to go to overtime or a shootout. I honestly believe the people who have such a hard time scoring aren't looking or making good scoring chances happen. Look for a screen to develop, crash the net after a point shot, throw an extra toe drag in your deke, all viable ways to score that work.