Actually I partially agree with the first top five teams, but I don't actually think arsenal is better than inter Milan, so in my opinion, inter Milan should had been ahead of them, and of a truth, this arsenal team is quite good, but we need to understand that experience is an important player after quality in a competition like this, and Arsenal we all know have that tendency of not being reliable in major competition especially in the champions league and I don't really sees them going as far as the semi final stage of this competition, because experience is very important, and that is what this particular arsenal team lack.
Most likely this happened because Araenal had a good performance in domestic competitions in terms of statistics although I agree with what you say where they are not better and maybe even it is comparable when aligning Inter with Arsenal but in terms of other things such as competition and possession statistics maybe Arsenal are better although if you reflect on productivity to date Inter are far superior.
This situation is likely to be temporary because during the group stage, round of 16 and now towards the quarter finals it looks like their chances will continue to differ and now we just have to see what will happen later because after all we must be aware that anything can still happen especially some clubs like Arsenal and Inter now certainly still cannot be released from tension because they still have to face leg 2 in contrast to some other big seeded clubs who have already confirmed themselves to be in the quarter finals.