After opening over a case of these minis, I can say that I'm quite underwhelmed by the miniatures in this group. There are plenty of repeat creatures - a large fire elemental, 2 more drow, 2 more yuan-ti, a new umber hulk, manticore, and drider. Do we really need more drow or elementals?
There is simply not a lot of originality in this set. The gelatinous cube - a long icon from the earliest days of D&D - finally appears in this set as a rare, but it is little more than a clear plastic box. I could just as easily use a clear box that originally contained dice or something else.
There were a few other minis which I thought were underwhelming. The visejaw crocodile resembled something I could buy as a souvenir in Florida. The warhorse was just a horse with saddle (which appeared to be too large for the scale of other minis). My daughter has similar-sized horse miniature toys. Finally, the macetail behemoth is an ankylosaurus, and you can find one in any package of dinosaurs at a toy store.
There were a few interesting minis in the lot - a farmer (complete with pig) was amusing, finally giving us some commoner figures. But these were in the vast minority.
What WotC needs to do is perhaps release warband packs - maybe a dozen minis that are thematically linked (orc war bands, drow and driders, elementals, adventurers, etc). That would allow a GM to pick up a pack for an expected encounter. Grenadier and other metal mini manufacturers did this long ago, and it worked well. Then WotC could devote the major minis expansions to being nothing but monsters.