Will MMLP2 sell well? Of course. If Eminem makes it, a lot of people will buy it. I doubt it will break a million during the first week. I'm expecting 550,000 units sold on week one.
Some history.
SSLP - My Name Is was strong lead single, and the album sold really well for a debut.
MMLP - The Real Slim Shady was a strong single. High sales.
TES - Without Me was a strong single. High sales.
Encore - Just Lose It wasn't so good, but he rode the buzz of his earlier albums.
Relapse - Worst lead singles. His weakest seller.
Recovery - Not Afraid and LTWYL were great lead singles. High sales.
With MMLP2 there are 3 singles, but none of the triumvirate are clear winners. They each have their checks and balance, but what Eminem really needed was a knockout punch.
Berzerk is easily my favorite of the three, but I doubt the public will respond to it nearly as well as I have. Rap God is for his hardcore fans only who eat that spiritual-miracle stuff up. And Survival is really confused (it's quite safe, yet not mainstream-friendly enough).
It seems like he tried to slice up a little something for everyone with three quite different singles, but none of them really hit hard. Because it feels like he made it court support from specific people rather than appeal to anybody (as his other strong singles have).