My country pioneered MMP in 1949, ask me anything as well.
As much as I think the system has served Germany well, it is a bit difficult to understand at times, especially with regards to overhang seats and independents.
For instance, in the German way, independents who win a local seat do not constitute an overhang, and instead reduces the total number of seats taken in account for top-up purposes by one, i.e. if an independent wins their district in a 20-seat Cosă, the total number of seats stays at 20. However, because independents don't affect the party-based distribution of the remaining seats, people who voted for a winning independent have their party vote ignored, lest they have double the influence on the result as other voters. This step is necessary because otherwise, local candidates could all choose to run as independents while the party vote stays unaffected, transforming Mixed-Member Proportional into Mixed-Member Majoritarian à la Japan.
As much as I think the system has served Germany well, it is a bit difficult to understand at times, especially with regards to overhang seats and independents.
For instance, in the German way, independents who win a local seat do not constitute an overhang, and instead reduces the total number of seats taken in account for top-up purposes by one, i.e. if an independent wins their district in a 20-seat Cosă, the total number of seats stays at 20. However, because independents don't affect the party-based distribution of the remaining seats, people who voted for a winning independent have their party vote ignored, lest they have double the influence on the result as other voters. This step is necessary because otherwise, local candidates could all choose to run as independents while the party vote stays unaffected, transforming Mixed-Member Proportional into Mixed-Member Majoritarian à la Japan.
