Inter are better than Bayern, that's just how it is now. Inter can defend and are clinical when going forward. They'll just counter Barcelona, it remains to be seen if Barcelona waste their chances because Inter will let them have possession.
As for Arsenal, they're decent attacking but they can't defend. PSG are better all round, but they really need to do better than what they did against Villa. A solid PSG performance and they win 9/10 times.