If you don't know, listen to others songs from those crews.
Some did half awesome-half commercial, and some did full awesome. So if you don't like a song, don't stop on that one.
And as always, lyrics are 80% of the song, so if you don't understand ... Heh ! Get a translation.
Luciano: Number 1 rapper in France (not only my point of view, but a lot of other rapper too).