I liked Obsidian, other than that cowl/mask thing. I like the face part, the black nylon covering that fits into his design, but the head covering part was kinda off. Too much trying to make him look like the comic. I think if they would have went a little looser or more fabric to make it more like Moon Knight, if you will, I think it would have shown better. I think.
Vixen was well done. Liked the way they showed her power set and good look.
Stargirl was also well done all around.
Not enough Dr. Mid-Nite for me (one of my first childhood heroes that I thought was cool), but with Obsidian around it was hard to showcase him other than a "I can see in the dark" thing (but I only watched about 20 minutes, soooo)
Commander Steel was ... really an ass.