I haven't purchased anything since series 2 of Reach, but i picked up an elite from halo 4 and i got to say, nothing much has changed with these; good sculpts, paint apps are a little sloppy but decent enough and the articulation is terrible. Its not a lack of joints that bothers me, its that McF doesn't seem to put much thought into making them actually usefull. Some of the early halo 3 figures were very well articulated in my opinion, but after reach its just been getting worse.
That said, i'm looking forward to the knight coming out next month (hopefully) and i'm curious to see if there's any plans for a didact figure down the line.