You're right, as you said, this isn't a surprising result. Chelsea are indeed quite strong this season, despite their failure to secure full points in the opening week. However, we also need to look at the broader strength of a team.
The real test for Chelsea will come when they face Liverpool, Arsenal, or Manchester City. If Chelsea can match them or even beat them, I think Chelsea deserves to be the favorite to win the title this season. Maresca has been slowly turning Chelsea around after a poor run of form.
A breath of fresh air could indeed come to the Blues if they can overcome opponents like Liverpool, Manchester City, and Arsenal. In the Premier League these three teams will pose obstacles for Chelsea if they want to stay at the top. So before that time comes, Chelsea needs to capitalize on their matches against other teams to continue earning points.