I think this thread underscores the favt that to a degree Pharrell and The Neptunes have been overrated due to recency bias. Why?
Let's look at it:
Out of the albums they've helmed or fully produced, how many of them have actually been successful? This a duo who at one point produced 40% of the songs in the Top 40 yet none of the albums they helmed or entirely produced made it past gold. The ones that did were propelled by songs produced by other producers. Take Justified by Justin Timberlake for example. "Cry Me A River" is a huge part of that album's success. The only other one is Gwen Stefani's Sweet Escape, but this was coming off of an album with multiple hits that was like 4X platinum.
When it came to breaking new artists, they had Kelis and Clipse. Both were gold acts at the peak of The Neptunes run. By comparison, they put up similar numbers to Bubba Sparxxx, Tweet, and Petey Pablo. They didn't introduce the world to superstars with their sound in the way that a Dre (Snoop, Eminem, 50 Cent, Game) or a Timbaland (Missy Elliott, Ginuwine) did.
In the realm of R&B, SWV's "Use Your Heart", Usher's "U Don't Have To Call" and 702's "I Still Love You" are classic, but where's the classic albums? Aside from Usher's "U Don't Have Call", they don't really have smash R&B hits that would compare to Jermaine Dupri, Timbaland, The Dream & Tricky Stewart, Jimmy Jam & Terry Lewis.
The Neptunes dropped The Clones at the height of their popularity, it went gold despite "Frontin" being huge. Dr. Dre, Kanye, and Timbaland have platinum and multi-platinum albums as artists.
In Search Of... is one of my favorite albums. Classic album. Fell through the cracks in spite of the insane popularity of Neptunes production from 2002-2006. And that's pretty much the story of every N.E.R.D album.
Sales aren't the end all, be all, but this was one of the biggest production crews ever and while they were able to turn numbers for established acts like Snoop, Nelly, Jay Z, Ludacris, Gwen Stefani, etc., they struggled with breaking new acts.