I feel like Game 1s are just warm-ups/practice for the favored team, so they let the underdogs win Game 1 so they get their confidence all high.
Then in Game 2, the home team go out full force and take away whatever hope and confidence the underdog teams had. Just ask Philly and Toronto.
As Doc Rivers like to say, "a playoff series does not start until you win on the road." So far, the Spurs, Nets, Magic, and Clippers have started their playoffs. Now for the favorites to start winning on the road.