All the matches are worth to bet except PSG vs Barcelona, I see PSG is way stronger than Barcelona. While the rest, the underdogs have a same chance to win, but people underestimate them.
Arsenal vs Bayern Munich, Bayern Munich to win @4.00
Real Madrid vs Manchester City, Real Madrid to win @2.70
Dortmund vs Atletico Madrid, Dormund to win @4.50
The way Real Madrid players are performing this season I'm not sure they are ready to get the Champions league title this season. The champions league will be tough for Real madrid because the players are not putting efforts in their games. I think because of how Real Madrid are not very strong this season their main concentration is to get laliga title and right now they are leading laliga. From the performance of Real madrid this season it looks as getting the Champions league won't be easy for them.
From the beginning to middle seasons, don't forget that Girona was leading and people might think they would become a champion. But Real Madrid proving themselves if they're more deserved to win, with their journey to rank up into the top position, I don't think they're not very strong...