The reason why the new episodes are not up to scratch with the old ones is because the in the new episodes all the characters are required to have their own story, whereas an old episode may only have one a two story or situations occuring in a episode.
A good example is the 'handicapped spot' or 'the standard' where the group is faces a situation together, and we see how each of them react to it.
In the new episodes, each character is doing something, or has a problem, but in the time span of 30 minutes or 22 and a half minutes (excluding add breaks) each character's story isn't properly explored...