First 2 seasons 5 stars. However, I feel from there on it went downhill. It was almost like the writers ran out of ideas and it got a bit too silly IMO.
The later episodes lack the use of the “new” characters powers and seems to be a teenage movie (all characters seem to have the Stiffler from American Pie mentality). So to summarize start of episode something drastic is revealed, the cast then fumbled through with lots of sex and one liners and there is a resolution at the end. This seems to be the normal from episode to episode.