Rating :

For music :
5,0 : Milestone / Masterpiece
4,5 : Essential
4,0 : Very good / Worth listening to
3,5 : Interesting / Some highlights
3,0 : Above average, but not fully convincing
2,5 : hmm... not sure
2,0 : Boring
1,5 : Bad
1,0 : Painful
0,5 : Unlistenable

For movies :
5,0 : Mon île déserte
4,5 : Essential and (or) Masterpiece
4,0 : Very good, maybe more
3,5 : Quite good, not wasted time
3,0 : Sometimes interesting
2,5 : Average, maybe less
2,0 : Boring most of the time
1,5 : Bad
1,0 : Pity
0,5 : Ugliest / Shameful