The last time the 2nd Group Stage was played was in the 2002/03 season. I remember it being pretty cool as there were always 4, top quality groups.
In my opinion it would be a lot more entertaining than the Round of 16 is.
An example of how good the groups were, this is the 4 groups from 2002/03:
Barcelona
Inter
Newcastle
Leverkusen
Valencia
Ajax
Arsenal
Roma
Milan
Real Madrid
Dortmund
Lokomotiv Moscow
Man Utd
Juventus
Basel
Deportivo
In my opinion it would be a lot more entertaining than the Round of 16 is.
An example of how good the groups were, this is the 4 groups from 2002/03:
Barcelona
Inter
Newcastle
Leverkusen
Valencia
Ajax
Arsenal
Roma
Milan
Real Madrid
Dortmund
Lokomotiv Moscow
Man Utd
Juventus
Basel
Deportivo