Professional ratings
Aggregate scores
Source	Rating
Metacritic	65/100
Review scores
Source	Rating
AllMusic
Entertainment Weekly	B
PopMatters	(7/10)
RapReviews	(8/10)
Slant Magazine
Stylus Magazine	B−
Vibe	favorable
XXL Magazine

4:21 ...The Day After is the fourth studio album by American rapper and Wu-Tang Clan member Method Man. The album was released on the Def Jam label on August 29, 2006, to mostly positive reviews. The album features guest appearances from Fat Joe, Styles P, Redman, and various Wu-Tang Clan members. Production is handled by RZA, Havoc, Kwamé, Erick Sermon and Scott Storch, amongst others. U-God appears in the song "The Glide" but isn't credited.

In regard to RZA's contributions to the album, Method Man explained:

"RZA was the first name I said when I spoke to Jay Z, when he signed off on the album budget. I’m happy with the outcome, but I think RZA could have had a little bit more input, but he was busy at the time."

"This is just more RZA on production, shit like that. But some of the shit I couldn't do, because some of these producers were screaming out these niggas want a $100,000 for a track. Fuck that! Kiss my ass. I'm not paying nobody a $100,000 for shit, unless I can live in that mothafucka."

Method Man explained the album's title:

"The national weed smoking day is 4/20, so I named my album 4/21 the day after. Because after that day, you have this moment of clarity when you’re not high and you see things clearly."

...
Wikipedia