The results are two episodes that feel tonally right in line with their predecessors, but fresher to the TV landscape. They're not particularly funny, nor are they all that insightful, but they do give us an honest character study unlike any other.
The fourth season effectively channels the raw vitality of WTF’s early days, when Maron was trying to dig his way out of a hole by embracing the world around him instead of pushing it away.
Maron may not delve that deeply [into substance abuse]--by Episode 2 of the new season, Marc is showing signs that he’s the same irksome guy in rehab that he was before. But if nothing else, the premiere does effectively, yet comedically, show two truths of substance abuse: Addicts need enablers who fuel their problem, either deliberately or inadvertently, and most need someone to intervene to help them climb out of the pit.