Illmatic and Reasonable Doubt were debuts so they can't be flops.I also listed DMX's Flesh of My Flesh, Blood of My Blood, Illmatic, and Reasonable Doubt
If you saw Vol. 3, I don't see how you missed those considering they were in the same post.
Just going off the top of my head, I wouldn't say that Flesh is a flop because it had an enormous first week and sold close to what the first album sold. I don't think the singles did as well. I'm not sure and I'd need to check certification dates. Either way, it was a wildly popular album at the time, so I'd be hard-pressed to say it was a flop. Even though I thought it paled in comparison to the first album.