I think randomized packs of minis is an easy way for WotC to get out of having to predict which minis will be popular and which won't. They just have to dump them all together and then buyers have to go to a secondary market to get what they really want.
Originally, I was somewhat interested in the new minis. But after I started reading reviews from people who got piles of useless halflings but never the minis they really wanted, I changed my mind. Now I think it's a waste of money for (IMO) poorly painted minis, some of which look downright awful.
I'd rather spend my money on individual blister packs of metal minis that are far superior in quality and I know what I'm getting beforehand. I find that unpainted minis are just as good as painted ones b/c people can imagine an unpainted mini in any number of roles whereas a black-robed wizard is going to usually be construed as a bad guy. Painted looks cooler, but unpainted is more versatile.
Thumbs down to WotC minis...