I haven't seen Arsenal doing pretty good in UCL, and this is the highest stage that they have reached so far. Madrid is the team that I know has been extraordinary when it come to the Champions League. I believe that there's nothing Arsenal can do to stop their termination from the competition by Madrid. Barcelona need to put in their best performance, because Dortmund shouldn't be underestimated
I won't write off Arsenal just like you wouldn't write off Dortmund. The fact Arsenal are even performing better to me than Dortmund this season in the Champions League is one key reason why I think Real Madrid are having a stronger opposition than Barcelona.
I'm not disrupting the fact that Real Madrid has often find a way to dominate in the Champions League and this may not be any difference but they also needs to be really careful of the Gunners.