Benfica is three stars, they beat us last year. Chelsea is four stars and we are obviously not on their level. The five star sides make sense as well if you consider that Atletico has a lot of merit for reaching the final, plus they just beat Real as well.
We're certainly a star above Roma, Shaktar, Monaco (now that they sold Falcao and Rodriguez), CSKA. The other 3 star teams are debatable. But the fact GdS places us and Roma on the same level is absurd considering we beat them in the league by 17 points, while winning home and away matches, and with them not playing in Europe. If we're 3 stars, Roma is certainly 2. As is Monaco, Shaktar, CSKA.