Yes, it's something that can't be predicted. There are teams that have won by a significant margin, like Inter who won 5-0 against Torino, but it's very difficult to understand who could win the championship. There are certainly teams that are already imposing themselves, but it's really difficult to understand on the first day. I wouldn't make any predictions.
Inter Milan has taught me a lot of lessons last season which is why I was not moved by their Victory. It will be to early to point at any team at this point, this was just their first game of the season which was quite right, they very well which I cannot deny them the credit because despite they where playing against the weak team I was impressed. I was not surprised even before the game because I knew how aggressive inter  normally play anytime they faced weak teams. I will applause them if they can play like this when facing tough teams like Napoli and others.
The Italian league has just started, and some teams have started well, while others have started poorly. One thing we mustn't forget is the intense schedule of matches that will begin with the Champions League. The intense schedules make all the difference. A team with a good squad rotation doesn't drop points, or loses less, but if your squad rotation isn't good, you can start dropping points in the Italian League for the tough matches in the Champions League. Inter's win is impressive, but the Italian league has only just begun. We shouldn't praise them with a win or criticize a team with a one losing match .