Do you really believe their is a weak team in the Club World Cup? Wait if they had lost against Fluminense or Palmeires won't you all criticize them? We have seen Chelsea lost to worse team in previous seasons so the consistency of winning against small teams means they have improved a lot. Is it their fault that Manchester City or Al Hilal couldn't make it to challenge them.
They haven't met a serious team to test them yet but i will say they have improved a lot now and I believe they will still be better by next season they just lack a little bit of experience and playing in the champions league will help them just as this CWC have helped them.
If you look at the "group" stages, yes there were some small time clubs because of where they came from. Like Auckland for example has literally part time players. But, they were the best of where they are from so that is why it worked out for them.
However, Chelsea definitely played very well so far, and yet, they finished fourth last season, so not like they were some terrible team, they were already a decent team and I bet they will finish somewhere around the same place this season as well. I get it, it is not really that much of a guarantee that they will finish fourth again, but somewhere about 3-5th place should not be impossible for them to handle, they could make that work. I bet that they are going to end up with some good results.