Underrating these teams is not proper because we have seen how they performed well last season especially Arsenal and Leverkusen who did well in their respective domestic leagues.
These teams can give us some surprising performances in the Champions League next season.
I agree about only Leverkusen and Inter. Especially if Leverkusen maintain their performance this season also, they are a surprise candidate for the trophy I think. For Inter, I can say they were wonderful in the Serie A last season. A smooth performance. You would remember they were a finalist in the Champions League 2 seasons ago too. They can also be unpredictable.
But for Arsenal and Barcelona, I don't think so. Arsenal are stumbling here because of focusing mainly on winning a PL title. We saw it last season. When it comes to Barcelona, I think they have less chance considering their situation lately.
Leverkusen did excellently in their domestic league does not mean that they will be able to win UCL when last season that they were in their best performance, they were unable to win Atalanta in Europa finals. This is why I doubt whatever magic that they will do, champions league is not for clubs that came from Europa.
I am welcoming Bayern Leverkusen to the UCL. And i am promising that they won't make it to the semi-final or quarter-final of the tournament. At least having the experience and qualifying to the UCL is worth it.