just finished watching season 5,
I thought this started out kind of weak, some of the acting and general plot twists were a bit unbelievable (but pretty funny), then it got better towards the middle and ended alright.
Overall here is how I'd rank the seasons
-Fourth
-First
-Second
-Third
-Fifth
I mean by the fifth season all the good characters had been killed or weren't part of the main story, and 'Marlo' was just too shit a character (and the actor was shit) to be the main focus for the drug side, he was so much less believable than Avon, stringer bell, bodie, etc....his character was just so weak and contrived (and that last seen where he randomly goes up to a street corner and starts a fight was laughably bad)