The Warriors went 73-9 in the regular season. In addition to setting the all-time NBA record for wins (as well as various other marks), Golden State also finished 16 games better than the Cavaliers (57-25).
For comparison, do you know who Cleveland was 16 games in front of? The 41-41 Washington Wizards, who ended up 10th in the Eastern Conference and missed the playoffs (also the 41-41 Rockets, the eighth seed in the West).
The gap between the two Finals participants was equivalent to the difference between the No. 1 and No. 10 squads in the East this year. By that logic, the Warriors should be a bigger favorite over the Cavs than Cleveland was in its No. 1 vs. No. 8 first-round matchup against the 44-38 Pistons (a sweep). Obviously it's not that simple--unless this series becomes a blowout, in which case maybe it is.