I just don't understand why the quality of the minis had gone downhill so much. Generally speaking, paint and sculpt quality got good with Giants of Legend and incrementally rose until War Drums, with which set paint quality plummeted to the point where WotC actually bowed to the outcry and promised not to use paint masters in their previews any longer.
The next three sets were improvements on War Drums, though arguably not reaching the quality of sets pre-War Drums. Then, with Desert of Desolation ... ugh. Scaling got (even) worse, the minis lost significant detail in the sculpts (though I, possibly in the minority, liked some of the odder poses) and what is with the shiny, gloppy, paints, and severe curtailing of paint-steps?
I'm also unhappy about the choices they've made for inclusion. Why another Huge red dragon, before giving us a Huge green? (Or even a Huge black with no rider?) Why yet another fire giant? Here we are on yet our third owlbear. Blockroot Treant? Enormous Carrion Crawler? A third "inhuman angel" in as many sets? Are you kidding me? Why so many crappy Medium Rares?
WotC lost a fair amount of my DDM business (say, 25 percent) because I don't like the new version of the skirmish game, but I've stopped collecting full sets because of the quality. (And if you folks knew how OCD a collector I am, you'd know that's saying something.)
Oh, and for those of you wondering about tiefling and dragonborn minis ... you'll be able to get them -- Rare or not -- for $2 each. Maybe less.