Can't help but feel PSG are overhyped due to one good match against Liverpool. Sure, they are a good team, but they aren't best in Europe yet.
On their way to the quarters, they lost a few matches to teams best in Europe that they shouldn't be losing to and didn't automatically qualify. They have gotten better as the season gone on but they are another season away from developing that killer instinct right at the very top.
PSG are the clear favourites in the match against Villa but not runaway favourites as with Barca vs. Dortmund.
I can't see Arsenal getting anything but thumped by Real over the two legs, but there should be lots of goals at both ends as Real just don't seem to prioritise defending.
I think Inter are favourites against Bayern due to Bayerns injuries to key players. Lowest scoring tie, probably.