That's were the problem lies, you are judging based on big names without considering the current form of the teams and not their previous achievements. Remember PSG beat Liverpool at Anfield in regulation time before the added extra 30 minutes which Liverpool couldn't score in their home. PSG knocked out 3 premier league teams on a stretch, something I don't see inter Milan doing. Shutting out Liverpool and Arsenal attacks from scoring in both matches played in England is no small job. Try to see the extent of what PSG did before getting to the final, then you will realise that they are not a team to be underrated in this final. As far as this final is concerned, I will remain neutral because both teams deserves the trophy. But trying to think that PSG got it easier on their way to the final is what I don't agree to.
PSG knocked out Liverpool and Arsenal. They are one of the best teams. Inter though has knocked out both La Liga and Bundesliga winners to reach the finals. Statically PSG have never won the champions league and Inter Milan has won more than all french teams ever combined. But most of those Inter's win were from another decade. Inter did reached the finals two years prior too but what's more important is current form. Both of these teams has eliminated one of the top teams in Europe and undoubtedly are among the best. But deep down inside, I believe PSG would win the title for the first time. It could be bias or a preference but the bookies are also preferring PSG.
The teams that PSG and Inter eliminated were very deep-rooted and always ready for the Champions League. Although I have a feeling that PSG's style of play will defeat Inter, Inter is a very, very stubborn team, they don't give up if they don't win and they insist on the winning goal and then get what they want.
They did this in the Barcelona match, they can do the same to PSG. OK, PSG eliminated the best teams in the Premier League, so Inter eliminated the best teams, not the empty teams. It will be difficult for PSG until the last second.